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Want to kickstart your greenhouse garden this season? The best time to begin is now. Cool-weather crops like arugula, bok choi, spinach, and radishes thrive in early spring greenhouse conditions—even in unheated spaces. Warm the soil with heating cables or IRT mulch to speed up germination and enjoy a head start on the growing season. Greenhouse gardening in late winter or early spring also means fewer pests, like flea beetles. While heat-loving plants like peppers need more warmth to sprout, starting them indoors on a damp paper towel can ensure strong, healthy transplants later. With the right timing and a simple crop schedule, your greenhouse can produce fresh greens and veggies year-round.

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Schedule Your Greenhouse Garden Now

Showing off my arugula (also known as rocket) on Instagram leads to a lot of questions about my greenhouse and what I currently have growing. 

Optimizing Your Greenhouse this Winter by Growing Food Year-Round

In my region an atmospheric river flooded out roads, rails and farms. This probably seems pretty minor compared to areas affected by cyclones and hurricanes but one thing is certain: there has never been a better time to own a greenhouse.

Quick Answer:

What Are the 5 Tips for Keeping My Greenhouse Toasty This Winter?
To keep your greenhouse warm and your plants thriving in winter, start by growing cold-tolerant crops and installing an electric plug with a thermostat to control supplemental heat from soil cables or space heaters. Add frost protection by layering Agribon fabric, build mini-insulated zones for tender plants, and use old-school lights or warming tools for targeted heat. Finally, keep air circulating year-round with fans to prevent cold pockets and strengthen plant growth.

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Keeping Your Plants Cozy This Holiday Season

Imagine my surprise when a small hole we drilled through our greenhouse foundation became a runway for mice. We pulled an extension cord into my greenhouse through that hole and the tiny gap became a neon sign for rodents.

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What are the best tactics to keep your plants alive in a winter greenhouse? Protecting plants in winter requires matching their cold tolerance to the right strategies, such as using row covers, fabric shelters, thermostatic heaters, and airflow management to create microclimates within your greenhouse. Tropical plants should be moved indoors before the first frost, while semi-tropical species like citrus and bananas can thrive under floating row covers and supplemental heat. Temperate and hardy plants—like kale, arugula, and geraniums—often survive with less protection, but benefit from insulation, moisture, and bottom heat for propagation; overall success depends on segmenting your space, monitoring temperatures, and applying targeted heating only where needed.

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Row Cover, Fleece and Heaters 

All these items will help your winter greenhouse. 

There are many plant varieties and they all require different night temperatures to sustain their growth.

Greenhouse night temperatures