I get this question at almost every farmers market and workshop we do: can you really grow microgreens year-round in Florida? The short answer is yes, absolutely, and we do it at Wholly Water Farms every single week of every single month. But the longer answer involves understanding why Florida's climate creates specific challenges for indoor growing and how to address each one without spending a fortune on equipment.

The key insight is this: growing microgreens indoors eliminates seasonal barriers by definition. Your microgreens do not care whether it is July or January outside your window. They care about the temperature, humidity, and light conditions inside your growing space. The challenge in Florida is that your indoor environment is heavily influenced by what is happening outdoors — and what is happening outdoors in a Florida summer is brutal.

Why Is Indoor Growing the Key to Year-Round Microgreens in Florida?

Indoor growing is the key because it decouples your production from Florida's extreme seasonal swings. Outdoor microgreen growing in Florida is impractical for most of the year — summer temperatures above 90 degrees cause rapid bolting, excessive leginess, and poor flavor development in most varieties. Winter is better outdoors, but inconsistent temperatures and occasional frost make production unreliable. By moving indoors, you control the three variables that matter: temperature, humidity, and light. Every tray gets the same conditions whether you plant it in August or February.

This is not theoretical for us. Our production numbers at Wholly Water Farms are essentially flat across all twelve months. The trays we harvest in July are indistinguishable in quality from the ones we harvest in December. That consistency is what restaurants and retail customers depend on, and it is what makes year-round production financially viable.

How Do You Handle Florida Summer Heat in a Grow Room?

Summer heat is the single biggest challenge for year-round microgreen growing in Florida. Garages, sheds, and spare bedrooms in unairconditioned spaces can easily reach 95 to 105 degrees from June through September. Microgreens perform best at 65 to 75 degrees. That gap between ideal and actual temperature is where your production quality lives or dies.

There are three approaches, listed from least to most expensive:

Timing your harvests around heat: If you grow in an unairconditioned space, shift your growing cycle so that the blackout germination phase (the warmest part of the process) happens during cooler overnight hours. Seed trays in the evening. Use the natural temperature drop between midnight and 6 AM to your advantage. This does not solve the problem entirely, but it helps with varieties like radish and broccoli that germinate in 2 to 3 days.

Insulation and ventilation: Insulating your growing space — even a basic layer of reflective bubble wrap on walls and ceiling — can reduce peak temperatures by 10 to 15 degrees. Combine this with exhaust fans that pull hot air out during the hottest hours and draw cooler air in at night. A 12-inch exhaust fan moving 1,000 CFM costs $30 to $50 and makes a measurable difference. This approach works for growers producing 20 to 40 trays per week who want to avoid the electricity cost of air conditioning.

Air conditioning: For consistent commercial production, air conditioning is not optional in Florida. A portable AC unit rated for your grow room size is the standard solution. A room producing 50 to 100 trays per week typically needs a unit rated at 8,000 to 12,000 BTU. The electricity cost runs $40 to $80 per month during summer at Florida's average rate of roughly $0.13 per kWh. That is a real cost, but when each tray sells for $15 to $25, the math works easily. We consider AC a cost of production, the same as seeds and growing medium.

How Do You Manage Florida's Humidity for Microgreens?

Florida's outdoor humidity regularly hits 80 to 90 percent in summer, and even in winter it often hovers around 60 to 70 percent. For microgreens, high humidity is a direct path to mold — the number one crop loss for Florida growers. Damping-off fungus, gray mold (Botrytis cinerea), and various seed-borne pathogens thrive when relative humidity in the growing space stays above 70 percent with poor air circulation.

A dehumidifier is essential equipment for any Florida microgreen operation beyond hobby scale. A 30-pint dehumidifier adequate for a small grow room costs $150 to $250 and draws roughly 300 to 500 watts. Set it to maintain 50 to 60 percent relative humidity in the growing space. This single piece of equipment eliminates more crop loss than any other investment you can make.

Air circulation works alongside dehumidification. A small oscillating fan or clip fan on each shelf of your growing rack keeps air moving across the canopy surface. Still air allows moisture to accumulate on leaf surfaces, creating ideal conditions for fungal spores to germinate. Moving air disrupts that microclimate. You do not need hurricane-force wind — a gentle, consistent breeze is enough.

One counterintuitive fact about Florida: winter is actually easier for microgreen growing than summer, despite being the dry season. Natural temperatures in most garages and indoor spaces sit in the 60 to 75 degree range from November through March without any climate control. Humidity is lower. Mold pressure drops. Your electricity bill drops. If you are starting out and want to minimize equipment investment, begin your microgreen operation in November and use the winter months to learn the process before summer arrives.

What Does a Year-Round Production Schedule Look Like?

Consistency is the foundation of year-round production, whether you are growing for yourself or for customers. At Wholly Water Farms, we run staggered planting schedules so that trays reach harvest every day of the week. The basic framework works like this:

We divide our production into seven-day and ten-day cycles depending on variety. Fast growers like radish and broccoli complete their cycle in 7 to 8 days from seeding to harvest. Slower varieties like sunflower and pea shoots take 10 to 14 days. By seeding the appropriate number of trays every day, we ensure that the same number of trays reach harvest maturity each day. No feast-or-famine weeks. No gaps in our market supply.

For a home grower or small-scale operation, a simpler approach works: seed a batch of trays twice per week, every Monday and Thursday. With a mix of fast and slow varieties, this gives you harvests on roughly Wednesday, Thursday, Saturday, and Sunday — covering both midweek restaurant delivery windows and weekend farmers market schedules.

Which Microgreen Varieties Perform Best Year-Round in Florida?

Not all varieties handle Florida's conditions equally. The ones that perform most consistently through all seasons at our farm are:

Sunflower: Tolerates slightly warmer temperatures than most varieties. Consistent 10 to 12 day cycle year-round. Our highest-volume seller.
Radish (all types): Fast cycle (7 to 8 days) means less time for problems to develop. Red Rambo, Daikon, and China Rose all do well.
Pea shoots: Prefer cooler temperatures and can struggle in unairconditioned summer spaces. In climate-controlled rooms, they perform beautifully year-round. Ten to fourteen day cycle.
Broccoli: Reliable and fast. Seven to ten day cycle. Good heat tolerance for a brassica. Strong market demand driven by sulforaphane interest.

Varieties that struggle most in Florida summers without AC include cilantro (bolts immediately in heat), basil (surprisingly mold-prone despite being a warm-weather plant), and wheatgrass (develops off-flavors above 80 degrees).

Does Year-Round Production Make Financial Sense?

Absolutely, and that consistency is precisely what separates microgreens from seasonal outdoor crops as a business model. Restaurant customers need to know you can deliver every week — not just when the weather cooperates. Farmers market customers build habits around your presence. If you disappear for three months because your garage is too hot to grow in, you lose those customers to competitors or substitutes, and winning them back takes months.

The additional costs of year-round production in Florida — primarily air conditioning and dehumidification — add roughly $60 to $120 per month to operating expenses during the summer months. Against revenue of $750 to $2,000 per week for a small commercial operation, that is a negligible cost for maintaining consistent income. The alternative — shutting down for four months — means losing $12,000 to $32,000 in potential revenue. The AC pays for itself many times over.

For a deeper look at microgreens business economics, see our Microgreens Masterclass series. And for equipment recommendations, our grow light guide covers the lighting side of indoor setup.

Frequently Asked Questions

What temperature should a microgreen grow room be?

The ideal temperature range for most microgreen varieties is 65 to 75 degrees Fahrenheit. Sunflower and radish tolerate the upper end of this range well. Pea shoots and wheatgrass prefer the cooler end around 65 to 70 degrees. Temperatures consistently above 80 degrees cause leggy growth, poor flavor, faster spoilage, and increased mold risk. Temperatures below 60 degrees slow germination and extend growing cycles significantly.

Do you need a dehumidifier for microgreens in Florida?

Yes, a dehumidifier is essential equipment for any Florida microgreen operation beyond a few personal trays. Florida's ambient humidity of 70 to 90 percent during summer creates ideal conditions for mold, the leading cause of crop loss in microgreen production. A 30-pint dehumidifier set to maintain 50 to 60 percent relative humidity in your grow space costs $150 to $250 and will prevent far more in crop losses.

Can you grow microgreens in a Florida garage?

Yes, with modifications. A Florida garage is a viable microgreen growing space during the cooler months from November through March without significant climate control. During summer, you will need insulation, ventilation, or air conditioning to keep temperatures below 80 degrees. Humidity control via a dehumidifier is needed year-round in most Florida garages. Many successful microgreen businesses in Florida started in exactly this space before moving to dedicated facilities.

How much does it cost to run a grow room year-round in Florida?

For a small grow room producing 30 to 50 trays per week, expect monthly utility costs of $80 to $150 during summer (grow lights, AC, dehumidifier, fans) and $40 to $80 during winter (grow lights and fans only, minimal or no AC). Annual electricity cost for a small commercial microgreen operation in Florida typically runs $800 to $1,500. These costs are modest relative to the revenue potential of consistent year-round production.

Is winter or summer easier for growing microgreens in Florida?

Winter is significantly easier. Natural indoor temperatures from November through March in most Florida spaces fall within the ideal 65 to 75 degree range without air conditioning. Humidity is lower, reducing mold pressure. Electricity costs drop because you need less climate control. If you are new to microgreens, starting your operation in fall or winter lets you learn the growing process under the easiest conditions before tackling the challenges of summer production.