Quick Answer:

What Are the Tips for Growing Greenhouse Tomatoes in the Heat?
To prevent heat stress and flower drop in greenhouse tomatoes, use 40-70% shade cloth to reduce temperature and light intensity, maintain good air circulation with fans and open screen doors, and regularly water soil and paths to cool the environment and increase humidity. Selecting heat-tolerant tomato varieties, like smaller-fruited types or proven heirlooms such as Juliet and Cherokee Purple, helps ensure fruit set during hot spells. Combining these strategies allows growers to maximize tomato yields and extend the harvest season even in extreme summer heat.

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The Trouble with Greenhouse Tomatoes

Do your greenhouse tomatoes have heat stroke?

If your tomato blooms are bending and falling off, flower and all, they are having a heatstroke. When extreme heat hits, greenhouse tomatoes fail to set fruit even as the leaves keep growing and new blooms appear.

 

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 tips for ordering seeds and supplies for hobby greenhouse growing? To succeed in hobby greenhouse gardening, it’s crucial to read seed catalog fine print carefully—choosing parthenocarpic varieties for cucumbers and zucchinis that don’t require pollination, selecting heat-tolerant and slow-bolting plant varieties, and using foliar fertilizers for cold soils. Understanding pollination needs, temperature tolerance, and plant growth habits ensures better yields and healthier crops year-round. Starting seeds indoors, like onions in January, and adapting to your greenhouse environment helps optimize growth and harvest success.

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Before You Order Seeds for Your Hobby Greenhouse, Read the Fine Print

 

When I started growing in my Greenhouse Garden a few of my favourite plants stopped working for me. That's what I learned to read the catalog fine print and adapt my shopping for a better hobby greenhouse growing. 

Quick Answer:

Strategically rotate crops by seeding quick growers like radishes and greens alongside longer-season vegetables, using every opening in your greenhouse to maintain continuous harvests from early spring through late fall—without needing a rigid chart, just readiness and smart succession planting.

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My crazy dogs

Corle ran ahead of me on the beach and stuck her head right into a dead seal. And then she took a big bite. 

Quick Answer:

Growing prize-winning tomatoes requires a greenhouse for earlier ripening and protection, careful late-summer pruning and low-nitrogen fertilization with calcium, consistent watering, and good air circulation to produce healthy, blemish-free fruit ready for competition.

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My tomatoes are sitting beside me in the front seat of my shiny black station wagon. We are on our way to the fair!