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...

Quick Answer:

Sterilizing your soil, pots, and trays is essential when starting seeds in a greenhouse to prevent disease, improve seedling survival, and create optimal growing conditions—use commercial seed starter mixes, sterilize reused containers with bleach, and consider homemade sterile blends or soil baking for best results. 

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Sterility in the greenhouse sounds somber but in a few instances, it truly matters and saves gardeners from hassle and disappointment. Here is where I heed caution.