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Indoor marijuana cultivators share pre-harvest tips for lighting, nutrients, temperature and irrigation

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Such preparation applies to indoor, greenhouse and outdoor grows, each of which is subject to unique challenges.

While indoor cultivation is ostensibly the most controlled environment, problems in indoor grows can quickly spin out of control if cultivators don’t plan meticulously and watch their crops vigilantly to keep plants on schedule.

“For all of our crops, we have targets for everything that needs to happen in their day-to-day life span. All of our schedules work on a harvest schedule,” said Nic Robertson, vice president of operations in Massachusetts for multistate operator 4Front Ventures, which is headquartered in Phoenix.

“If I want to produce 300 pounds of Blue Dream on the menu on this date, I need to have it tested by this date, which means I need to harvest it by this date, transplant it by this date and so on and so forth.”

There is some flexibility to tweak those schedules if a crop needs to finish earlier or later than expected to get the best possible flower.

But changes to harvest schedules can’t be made without considering the possible impacts on cannabis plants.

“No single decision that we make is isolated from all the rest of the scheduling,” Robertson said.

Ryan Cook, executive vice president of operations at Florida-based Jushi Holdings, another multistate operator, agrees that planning and preparation make for a successful harvest day.

“A lot of work is done on the front end so that, by the time we get to harvest, there’s less subjective decision-making at the back end,” Cook explained.

“We’ve got full-on harvest prediction planners where we can see when the clones we took this week are going to be harvested.”

While cultivators who plan their indoor harvests weeks in advance have their own ways of preparing, there are several commonalities they use to ensure a successful harvest. These include adjustments to:

  • Lighting.
  • Temperature and humidity.
  • Nutrients.
  • Watering and flushing.
  • Defoliation.

The changes often depend on specifics of the cultivation environment – size of growing room and plant canopy, strains being grown, type of HVAC system and lights being used – and growers will have to figure out what pre-harvest tactics work best in their respective environments.

Lighting

Indoor cannabis growers often make pre-harvest adjustments to light intensity and spectrum.

During the first week of the flowering phase, Jushi starts the LED light intensity at 700 micromoles (micromoles are a unit used to measure brightness).

By the time the plants hit week three of flowering, cultivation staffers have moved the lights roughly 10 to 12 inches closer to the canopy, increasing the micromoles to anywhere from 1,000 to 1,400, according to Josh Malman, Jushi’s vice president of cultivation.

They maintain that level of light intensity until the final week of flowering, when light intensity is returned to 700 micromoles.

“That helps reduce the temperature on the canopy a little bit and helps to maintain those terpenes from volatizing off near the end of the cycle,” Malman said.

Some cultivators also like to expose their plants to extra red light.

By introducing a few minutes of red-spectrum light per day, growers can go from the typical flower-phase light cycle of 12 hours for both light and darkness to a cycle of 13 or so hours of light and 11 hours of darkness.

The additional light, some growers say, increases yields and promotes a richer cannabinoid and terpene profile.

Heat and humidity

Temperature and humidity levels also can be lowered as harvest approaches, with the aim of beginning to dry out the plants.

Less moisture preserves terpenes and protects against microbial contamination, which is more common late in the flowering phase, when plants are big and near full maturity.

Lowering temperatures inside a grow room toward the end of the flowering phase can benefit flower quality because it mimics the cooler temperatures of fall.

“It helps those buds tighten up a little bit. They start to notice it’s getting cold, so they start to tighten up. They get a little bit harder, they get a little denser – and that’s obviously what we’re looking for in our final product,” Robertson said.

He warned, however, that “when you get too cold in a room, the dew point is going to promote a certain type of moisture in the air that promotes mold and pathogenic growth.”

Toward the end of the flowering phase and shortly before harvest, Robertson said he likes to maintain temperatures around 72 degrees; he also dials humidity back to 40%-45%.

Marco Malatrasi, director of production at Fluent Cannabis, which operates in Florida, Pennsylvania and Texas, also lowers his temperatures from the high 70s during the first several weeks of the flowering phase to the low 70s for the last few weeks of flowering.

“Most varieties will show a sensitivity to cold, and they’ll produce more anthocyanins,” Malatrasi said, referring to the purple and red pigments that appear on some cannabis strains.

Jushi, which maintains a temperature range of 78-82 degrees during the first several weeks of flowering, drops the temperature to 68-70 degrees near the end of the cycle, late in week seven or week eight.

“Lower temperature/lower humidity are keeping microbials low,” Malman said, “And we’re not volatizing terpenes with high temperatures near the end.”

Lowering humidity near the end of the flowering phase also helps reduce moisture in the flower as harvest nears, said Frank Golfieri, the Massachusetts-based director of cultivation for multistate cannabis operator Insa.

Golfieri likes to gradually reduce temperatures to about 60 degrees and 50% humidity by harvest.

Depending on the strain, he could start reducing temperature and humidity a few days or a couple of weeks before harvest.

Nutrients

Another important change that cultivators make as harvest nears is their use of nutrients.

“Harvest is an important time to cut back on certain nutritional inputs and maybe increase others,” Robertson said. “Hands down, the most important nutritional input that will direct how the plant is growing at any stage is going to be nitrogen.

“If we don’t start to lower our nitrogen, that plant is going to hormonally think at some point that it still wants to produce some sort of vegetative growth, meaning it will expand in size or wants to put more work into its family’s production.”

Growers at 4Front typically start reducing nitrogen inputs about halfway through the flowering cycle “in anticipation of harvest, to make sure that the plant is focusing its energy in all the right places,” such as bud, resin and cannabinoid production, Robertson said.

“Usually at that stage is where we start to skew the overall balance of nutrients that are being delivered to the plant. Where we start to drop nitrogen is where we start to increase phosphorus and potassium. Because there are three major nutrients: the N, P and the K. We start to drop the N, we start to increase the P and the K.”

Cook from Jushi cautioned, “If you reduce nitrogen too early, you may cause some early senescence (deterioration) of leaves, which potentially causes microbial or bacterial fungal risks.”

Watering and flushing

Another important part of pre-harvest prep is watering and, to an even greater extent, flushing the plant of nutrients. Flushing usually takes place in the last week or final days before harvest, the idea being that nutrients can negatively affect cannabis taste and how the flower burns.

“I think our recipe, like a lot of others, does have a natural taper in nitrogen as you make your way through the crop cycle, and it never really goes away until we start that hard flush, which is generally just a pH’d RO (reverse osmosis) water or pH’d city water that’s going into the crop,” Malman said.

But Malman and other growers caution against reducing or eliminating nitrogen too early.

“If you stop giving it food, it starves. It starves quickly, and you can see that plant start to decline. When that plant starts to decline, you get natural senescence for the flowers and the leaves. You start to get risks for detritus. So, we drive this hard (with nutrients) till close to the end,” he said.

“And the last three to five days, (we) give it a rest, because you’re probably not getting much growth out of it anyway at that point. But if you pull back two weeks early, you won’t get your crop to the finish line in a healthy manner. So, we really keep that going through most of the crop.”

As harvest nears – and especially as growers get to flushing time – it’s important to monitor a plant’s moisture content, Malman said.

As plants get older, they don’t drink at the same pace and don’t need the same amounts of water to propel their buds to grow.

But knowing the moisture content is critical. So, Jushi has sensors installed in rockwool and coco cubes, and the sensors are connected to the grow’s fertigation systems.

In less sophisticated facilities, Jushi cultivation workers use handheld moisture meters to determine how much to reduce water before harvest.

“It’s also important not to overwater in the final weeks, which can be difficult if you’re also trying to do flushing. The key is to find a balance,” Golfieri said.

“You’re trying to be careful to not flush the plant too heavily, because every time you do that, you’re stressing the plant because you’re putting a lot more moisture into the room that you have to pull out, which could cause issues. So, even toward the end, I’m almost cutting back, making sure it’s nice and even.”

Golfieri also noted that if plants are fed correctly throughout their life spans, “You won’t need to do much heavy flushing, which can be bad, because it involves using too much water, which can cause other problems when there is too much moisture in the roots.”

He added: “We don’t want to flush too hard, where it takes away a lot of the smell and even the color of a flower. We try to do it at a point where it’s just right.”

Source: https://mjbizdaily.com/marijuana-cultivators-share-pre-harvest-tips/

Business

EU Pressure Builds on Google as Regulators Face Calls for Massive Fine Over Search Practices

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A growing coalition of European industry groups is intensifying pressure on regulators to take decisive action against Google over allegations of unfair search practices that could reshape competition rules across the region’s digital economy.

Investigation Under Digital Markets Act Gains Momentum

The case is being examined by the European Commission under the European Union’s landmark Digital Markets Act (DMA), introduced to curb the dominance of major technology platforms and ensure fair competition.

Launched in March 2024, the investigation focuses on whether Google has been prioritising its own services in search results, potentially disadvantaging rival businesses that rely on online visibility to reach customers.

Industry Groups Demand Swift Action

Several prominent European organizations have jointly urged regulators to conclude the probe without further delay. They argue that prolonged investigations allow alleged anti-competitive practices to continue, putting European companies—especially startups—at a disadvantage.

Signatories include the European Publishers Council, the European Magazine Media Association, the European Tech Alliance, and EU Travel Tech.

In a joint statement, these groups warned that delays in enforcement are affecting innovation, profitability, and growth prospects for regional businesses competing in digital markets.

Google Denies Allegations

Google has rejected claims of bias, stating that its search algorithms are designed to deliver the most relevant and useful results to users. The company has also proposed adjustments to address regulatory concerns.

However, critics argue that these changes are insufficient and fail to address the core issue of market dominance.

Potential Billion-Euro Penalties

If found in violation of the DMA, Google could face significant financial penalties. Under EU rules, fines can reach a substantial percentage of a company’s global turnover, potentially amounting to billions of euros.

Regulators may also impose corrective measures requiring changes to business practices, which could have long-term implications for how digital platforms operate in Europe.

Wider Implications for Big Tech

The case highlights ongoing tensions between European regulators and major U.S. technology firms. In recent years, the EU has taken a more aggressive stance in enforcing competition laws, aiming to create a level playing field for local businesses.

A final ruling against Google could set a major precedent, influencing future enforcement actions and shaping the regulatory landscape for global tech companies operating within Europe.

As scrutiny intensifies, the outcome of the investigation is expected to play a critical role in defining the future of digital competition across the European Union.

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AI & Technology

Amazon Faces Potential Criminal Trial in Italy Over €1.2 Billion Tax Evasion Allegations

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Milan: U.S. tech giant Amazon is facing the prospect of a major legal showdown in Italy, after prosecutors in Milan formally requested a court to move forward with criminal proceedings over alleged tax evasion totaling approximately ₹12,500 crore (€1.2 billion).

The case targets Amazon’s European division along with four senior executives, marking one of the most significant tax-related investigations involving a global e-commerce platform in Europe.

Trial Push Despite Multi-Million Euro Settlement

The move comes even after Amazon reached a financial settlement with Italian tax authorities in December, agreeing to pay around ₹5,500 crore (€527 million), including interest, to resolve part of the dispute.

Typically, such settlements lead to the closure of criminal investigations. However, Milan prosecutors have opted to proceed, signaling a tougher stance on alleged corporate tax violations.

A preliminary hearing is expected in the coming months, where a judge will decide whether to formally indict the company and its executives or dismiss the case.

Allegations of VAT Evasion Through Marketplace Sellers

At the center of the investigation are claims that Amazon’s platform enabled non-European Union sellers to avoid paying value-added tax (VAT) on goods sold to Italian consumers between 2019 and 2021.

Prosecutors allege that the company’s marketplace structure allowed thousands of foreign vendors—many reportedly based in China—to operate without fully disclosing their identities or tax obligations. This, authorities argue, led to substantial VAT losses for the Italian government.

Under Italian law, online platforms facilitating sales can be held partially liable if third-party sellers fail to comply with tax requirements, a key point in the prosecution’s case.

Italian Government Named as Affected Party

In their filing, prosecutors identified Italy’s Economy Ministry as the injured party, citing significant financial damage resulting from the alleged tax evasion.

Legal experts say the outcome of the case could have wide-ranging implications across the European Union, where VAT systems are harmonized and similar compliance rules apply to digital marketplaces.

Multiple Investigations Add to Pressure

The VAT probe is just one of several legal challenges facing Amazon in Italy. The European Public Prosecutor’s Office is reportedly examining additional tax-related issues covering more recent years.

Meanwhile, Milan authorities are pursuing separate investigations into alleged customs fraud linked to imports from China and whether Amazon maintained an undeclared “permanent establishment” in Italy—potentially exposing it to higher tax liabilities.

In a separate regulatory action, Italy’s data protection authority recently ordered an Amazon unit to stop using personal data from over 1,800 employees at a warehouse near Rome.

Amazon Denies Allegations

Amazon has consistently denied wrongdoing and indicated it will strongly contest the allegations in court if the case proceeds. The company has also warned that prolonged legal uncertainty could impact investor confidence and Italy’s appeal as a destination for international business.

Broader Impact on Europe’s Digital Economy

If the case moves to trial, it could become a landmark moment for the regulation of global e-commerce platforms in Europe. Governments across the region are increasingly scrutinizing how digital marketplaces handle tax compliance, especially in cross-border transactions.

With online retail continuing to expand, regulators are under mounting pressure to ensure that multinational platforms and third-party sellers adhere to the same tax rules as traditional businesses.

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Aviation

IndiGo Crisis Exposes Risks of Monopoly: What If Telecom or E-commerce Collapses Next?

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Airports across India witnessed scenes of distress and confusion as thousands of passengers were stranded due to IndiGo’s massive flight disruptions. Families with medical emergencies, funerals, and personal crises were left helpless as the airline cancelled hundreds of flights without adequate communication or support.

Passengers described desperate situations — a mother pleading for sanitary pads for her daughter, a woman unable to transport her husband’s coffin, and others stranded while trying to reach family funerals or hospitals. “It was like a lockdown at the airport,” one passenger said, describing the panic that unfolded as IndiGo’s mismanagement crippled operations nationwide.

Root Cause: IndiGo’s Market Monopoly

The turmoil, industry experts argue, stems from IndiGo’s monopolistic control over India’s domestic aviation market. The airline operates nearly 2,100 flights daily and holds around 60% market share — meaning every second plane flying within India belongs to IndiGo.

This dominance has given the company unparalleled influence. When IndiGo falters, the entire aviation system suffers. Passengers are left with few alternatives, as other airlines lack capacity to absorb stranded travellers. The result: skyrocketing ticket prices, chaos at terminals, and total dependence on a single private operator.

Aviation pioneer Captain G.R. Gopinath, founder of Air Deccan, criticised the government’s inaction, noting that on some routes, IndiGo’s economy fares surged to ₹1 lakh. He compared the situation to a hostage crisis, writing that the airline “held the system ransom” and forced regulators to defer new safety rules meant to protect pilots and passengers.

Government Intervention and Regulatory Weakness

The crisis erupted after IndiGo failed to comply with the Flight Duty Time Limitations (FDTL) — rules introduced by the DGCA in January 2024 requiring adequate rest for pilots. Despite having nearly two years to adapt, IndiGo blamed the rule for operational disruptions, citing a shortage of pilots.

Under mounting public pressure, the government stepped in, temporarily relaxing FDTL norms and capping airfare hikes. Officials claimed the move was to protect passengers, but analysts say it exposed the state’s vulnerability to corporate monopolies. “The government had no option but to yield,” said one aviation policy expert, pointing out that ignoring safety regulations for short-term relief could have long-term consequences.

The crisis also rekindled memories of the June 2025 Air India crash near London, which claimed over 240 lives. Experts warn that compromising pilot rest and safety standards to maintain flight schedules could risk another tragedy.

If Telecom Giants Fail: A National Paralysis

The article raises a troubling question — what if a similar crisis struck the telecom sector, where Jio and Airtel together control nearly 80% of subscribers and serve over 780 million users?

If both networks failed simultaneously, the repercussions would be catastrophic. Internet shutdowns would halt UPI transactions, online banking, OTP verifications, video calls, OTT streaming, and emergency communications. Critical services such as airports, hospitals, stock exchanges, and small businesses — many of which rely on WhatsApp and digital payments — would come to a standstill.

In essence, a telecom breakdown could paralyse India’s digital economy, exposing the nation’s dependence on a duopoly.

E-commerce Monopoly: Another Fragile Ecosystem

The same risk looms over the e-commerce sector, where Amazon and Flipkart dominate nearly 80% of the market. A disruption similar to IndiGo’s could cripple daily life — halting delivery of groceries, medicines, and essential goods, freezing refunds and customer support, and leaving small sellers without platforms to trade.

Local retailers, freed from competition, might exploit shortages by inflating prices. Such a scenario underscores the perils of market centralisation in sectors critical to everyday living.

A Wake-Up Call for Regulators

The IndiGo crisis, analysts say, is a warning shot for policymakers and regulators. A single company’s operational failure exposed systemic weaknesses in India’s infrastructure and consumer protection mechanisms.

As the aviation regulator DGCA investigates and IndiGo works to restore normalcy, the broader lesson remains clear: unchecked monopoly power in any essential service — whether air travel, telecom, or e-commerce — poses a direct threat to economic stability and citizen welfare.

Without stronger competition laws, redundancy frameworks, and regulatory oversight, India risks repeating this crisis across multiple sectors — each time with millions of citizens paying the price.

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