Quick Answer:

Start tomato seeds in mid to late March with bottom heat, provide strong light and nutrients early, and move them into your greenhouse once temperatures consistently stay above 10°C (50°F); maintain airflow and prune lower leaves as fruit sets to optimize harvest into fall.

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So Many Tomatoes, So Little Space

Greenhouse tomato growers are rightfully confused when they see so many kinds of greenhouse tomatoes for sale. Karen Olivier, an independent tomato breeder from the Secret Seed Cartel, estimates there are 20,000 kinds of tomatoes listed right now and she is adding to that number by breeding new tomatoes every year.

 

Quick Answer:

What Are the Best Tips for Soil Amendments & Nutrients in a Greenhouse Garden?
Optimizing greenhouse soil requires building “super soil” by blending quality soil-less mix with compost, biochar, and worm castings, plus adding essential nutrients like nitrogen, phosphorus, potassium, calcium, and micronutrients through amendments such as seed meals, lime, kelp, and gypsum. Recognizing nutrient deficiency signs—like purple leaves from low phosphorus or brown spots from potassium shortage—helps timely fertilization and soil management, ensuring healthy plant growth and improved crop flavor. Regular soil amendment and fertilization tailored to plant needs foster vibrant, productive greenhouse gardens year-round.

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Importance of Soil Amendments & Nutrients in Greenhouse Gardening

A few years back my greenhouse tomato leaves were purple, yellow and spotted. Not all at once, but over time and on different leaves. It was the second year I was growing in my greenhouse and the commercial potting soil I bought was low on phosphorus, nitrogen and potassium. The leaves on the plants were telling me what was going on. And it didn’t look good.

Quick Answer:

How Can Warming Soil Help You Rush the Growing Season and Speed Up Crop Growth? Warming soil with electric heating cables prevents freezing, creates a heat reservoir that radiates warmth to plants, and accelerates seed germination and crop growth, enabling gardeners to start hardy and heat-loving crops earlier in the season for faster, more productive harvests.

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Is patience a virtue?

Some gardeners wait for the sun to gently warm the soil before they start their garden. Others are impatient.

Quick Answer:

How Do I Grow Arugula in My Greenhouse From Seed to Salad?
Arugula is an easy, hardy winter green that thrives in cool greenhouse conditions, reseeds itself naturally, and requires minimal pest control with simple mesh covers in spring. Growing your own arugula lets you enjoy fresh, flavorful leaves and edible flowers all winter long, perfect for salads or toppings. Understanding its growth cycle helps you maximize harvests and incorporate this nutritious green into your seasonal meals confidently.

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My go-to recipe

My potluck arugula salad is sprinkled with jewel-toned tropical pomegranate seeds. My neighbour Barbara is excited and quickly tells me how much she loves the bitter taste of arugula. So I tell her I grow arugula as a winter crop and now she is all ears.

What is the Best Soil for Greenhouse Growing?

Quick Answer:

What is the best soil for greenhouse gardening? The ideal soil for greenhouse growing balances drainage, nutrient retention, and microbial activity—making custom blends like loam, triple mix, or super soil more effective than natural or bagged top soils. Should you use bagged soil or soil-less mixes in a greenhouse? While convenient, most bagged top soils and soil-less mixes lack essential nutrients and structure for long-term crops, so combining them with compost or organic amendments is key. How can you create high-performance soil for greenhouse plants? Blending your own triple mix (one-third soil, compost, and peat) or upgrading to a nutrient-rich super soil with worm castings, biochar, and trace minerals provides a strong foundation for healthier plants, richer flavors, and vibrant blooms.

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If you are new to gardening and think growing is just a matter of adding water, you're in for a surprise. With terms like super soil, triple mix, natural soil, and even soil with no soil—it's no wonder new gardeners feel overwhelemed. So how do you choose the right soil for strong, healthy growth? And how do you get the most flavorful food and the brightest blooms?

Quick Answer:

What are the 6 essential tips for cleaning a greenhouse before winter sets in? The best time to clean your greenhouse is in late fall when plant growth slows, focusing on removing dead plants, reducing watering, clearing cobwebs, washing overwintering plants, and cleaning row covers to prevent pests and diseases. A thorough fall cleaning deters common greenhouse problems like mold, fungus gnats, and spider mites, ensuring a healthier growing environment for the upcoming season. Starting early and cleaning on a sunny day optimizes results and prepares your greenhouse for a productive spring restart.

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Its never too early to get a head start

My husband and I planned a mid-week ski trip but on departure day I was still in my off finishing a time-sensitive project. We were staying overnight at the hill, it was still a workday, and the car was loaded up. There was no rush to get moving.

Quick Answer:

Preparing your greenhouse for fall involves maintaining appropriate night temperatures for different plants, thorough cleaning to prevent pests and diseases, and proactive pest management using safe insecticidal soaps, sterilized soils, and yellow sticky traps to ensure a healthy growing environment.

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

Greenhouse night temperatures

Quick Answer:

What are the tips for managing and double cropping in a greenhouse to prepare for winter? Effective greenhouse management in summer involves double cropping fast-growing plants like radishes between slower growers such as peppers, using trap crops like beans to monitor pests, and starting winter-hardy crops early to maximize space and season length. Planning ahead by maintaining seedlings in flats and supplementing nutrients ensures continuous, healthy growth, allowing gardeners to transition smoothly from summer to fall and winter crops. This strategic approach optimizes greenhouse productivity year-round and helps prevent common pest issues.

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Surprisingly, Summer is the perfect time to prep for winterization

Managing your winter greenhouse with crops coming and going is a bit of an art form, so please bear with me. It involves starting seeds directly in greenhouse soil and also starting seeds in flats on shelves or potting benches.

Quick Answer:

How Do I Grow Pesticide-Free Strawberries in My Greenhouse?
You can grow clean, delicious strawberries year-round in your greenhouse by planting day-neutral varieties in rain gutters filled with soilless mix, spaced for airflow and watered consistently. Start with bare-root plants, trim roots before planting, and fertilize with natural options like alfalfa pellets. Growing in a controlled greenhouse environment lets you avoid pesticides entirely, beat the commercial “Dirty Dozen,” and harvest berries earlier and longer than outdoor growers.

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I was just reading about how over-sprayed commercial strawberries area. I was reading this on the same day I was planting up my own greenhouse strawberries!

BC Greenhouse Builders is thrilled to announce...