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BC Greenhouse Builders recommends installing a UV-stabilized shade cloth over your greenhouse in late spring to manage summer heat:

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BC Greenhouse Builders' Greenhouse Gardening School is an exclusive resource for BC Greenhouse customers, designed to help you get more from your greenhouse from day one. Hosted by Jordan Mara of Mind & Soil and horticulturalist Donna Balzer, the school covers everything from layout and design to soil, propagation, and plant care, with real customer gardens featured along the way. 

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 Jordan Mara,  Canadian gardener, mental health advocate, and founder of Mind & Soil, has spent five years building one of Canada's most trusted gardening channels. This season, a lifelong dream came true: his very own BC Greenhouse is installed and growing. He's documented every honest moment across three YouTube episodes, from a snowy install day to the first tomatoes in the ground in March. 

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What are the essential seed terms for greenhouse gardening? Understanding common seed terminology is key when planning your greenhouse garden. Heirloom seeds are stable, open-pollinated varieties that grow true from saved seed, while hybrid (F1) seeds are lab-created crosses offering traits like disease resistance or high yield but cannot be reliably saved. F2–F5 seeds are later generations from hybrids, gradually stabilizing into your own heirlooms. Pelleted seeds are clay-coated for ease of planting, especially by machine, while treated seeds are coated with chemicals to resist rot in cold soil—something many organic growers prefer to avoid. Terms like “new” may refer only to catalogue listings, not to truly new varieties. You’ll also see micro-tomatoes, compact plants ideal for greenhouses, and days to maturity, which are useful for comparing growth speeds across varieties but are not precise. Ultimately, buying seeds in bulk from fewer suppliers or saving your own seed helps manage rising shipping costs while still offering variety and value in your greenhouse garden.

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So much to consider

It is December and the seed catalogues are arriving fast and furious. Meanwhile, online suppliers are pounding out dozens of notices to remind us it is time to order seeds soon.

Growing Soil with Hügelkultur

When I moved homes and built a new greenhouse, I was in for quite a surprise. The natural soil on my new lot is sand. Pure, yellow sand. This means it drains really well. It also means it does not hold nutrients to feed my plants.

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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. 

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What are the tips for greenhouse gardening in March and April? Early spring greenhouse gardening involves starting fruit cuttings like raspberries over heat mats to encourage rooting, transplanting hardy crops such as peas for early harvests, and directly sowing cold-tolerant seeds like radishes, spinach, and arugula in unheated soil. By managing space, timing crops carefully, and using seasonally appropriate strategies, gardeners can extend their growing season and enjoy fresh produce well before outdoor gardens mature. This approach maximizes greenhouse productivity while creating a rewarding, year-round gardening experience.

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Sunshine on Your Face in the Greenhouse Garden

I close my eyes as I bask in the sun, heat on my face. I take off my jacket and then my hat. My neighbors, friends and family have gone away to Martinique, Belize and Spain but I am experiencing the best holiday. I am sitting in the sun at home – in my Greenhouse Garden.

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Worm castings naturally fertilize plants and support beneficial bugs like fungus gnat predators, but excess moisture and nutrients can also lead to algae growth—use well-draining soil, sticky traps, and fans to balance greenhouse conditions and protect seedlings.

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Pests, Worm Castings and Algae

What are Worm Castings?

Before we get to greenhouse gardening algae, let's talk about a shopper on Amazon that complained about bugs in her worm castings. If you don’t speak garden lingo yet, worm castings are simply worm poop. They are mixed with soil in garden beds or in pots to make tomatoes grow faster, stronger and healthier. And just in case you missed the memo, worm poop comes with bugs of its own. The good ones.

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BC Greenhouse Builders recommends a five-step approach for sensible greenhouse gardening success: