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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.

Previously, I put out a request for stories and projects that helped to shape the BC Greenhouse that we are today. Rick visited my office and mentioned the WindSong Cohousing project.  I had never heard of this project and ironically Cody found newspaper articles and stories about WindSong and left them on my desk this morning. I love how the universe works.

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What do I need to know when preparing a greenhouse foundation? Every greenhouse needs a solid, level foundation—typically wood or concrete—built to exact dimensions for proper fit, stability, drainage, and long-term success. Why is foundation planning essential for greenhouse performance and longevity? A well-prepared foundation supports structural integrity, ensures easy access to utilities, accommodates local conditions like slope or shade, and sets the stage for efficient growing and maintenance.

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Do all greenhouses require foundation?

The simple answer is YES

Over the years we have had hundreds of greenhouse-related questions and many of them are related to foundations.

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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.

What is the Best Soil for Greenhouse Growing?

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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?

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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.

The Benefits of a Home-Attached Greenhouse

With convenient access to water and power and designed to maximize the heating benefits of your home, the attached greenhouse is a must for those wanting to extend the season and enjoy the view into the garden. BC Greenhouse Builders offers a lean to greenhouse kit and a gable design for home-attached greenhouses. A lean-to is a roof that has a single slope with its upper edge adjoining a wall or building. A gable-attached greenhouse is a typical freestanding greenhouse with the gable end removed and attached to a wall.

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Fivewall polycarbonate is a durable, energy-efficient glazing option with high insulation (R-value 3.03), 62% light transmission, and excellent structural strength—making it ideal for cold climates, snow loads, and year-round greenhouse gardening.

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What is Fivewall Polycarbonate Glazing?

BC Greenhouses has been working with this glazing product for a few years. It was so impressive in terms of its energy efficiency that we built a new aluminum framing system to accommodate the wider profile. For example, a typical single glass greenhouse glazing is 3mm in thickness whereas the Fivewall polycarbonate is an impressive 16mm.

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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.

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How can I solve watering problems in my greenhouse garden? Using irrigation solutions such as shrubblers, soaker hoses, and self-watering pots helps maintain consistent soil moisture, reducing plant stress caused by irregular watering. These systems allow you to keep your plants healthy and hydrated even when you’re away, preventing common issues like wilting or nutrient deficiencies. By implementing these methods, you can improve plant growth, avoid over- or under-watering, and achieve higher yields in your greenhouse garden.

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Watering Problems?

Hand watering is fun for gardeners. If you are around to get the job done. But a wilted plant is a stressed plant and stressed plants get buggy. I would love to stay home all summer watering my
greenhouse at exactly the right minute but that’s just wishful thinking. The truth is, life gets in the way and instead of tending my tomatoes and pacifying my pak choi with hand watering I seem to travel just when my babies need me.