Ask a Question forum: Greenhouse plants that won't grow

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Jan 14, 2017 9:38 AM CST
My tomatoes in my green house are doing great. They are 10 feet tall and heavy yield. However my cucumbers put on small fruit that never get big. Radish and kohlrabi get 2" tall then just stall. Beets bolt with nice but very small leaf growth but no actual beat. I added a grow light over the kohlrabi but in 6 weeks they are only 3 " tall
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Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Jan 14, 2017 12:25 PM CST

I suspect the cucumbers you planted need a pollinator. Those little tiny cucumbers are part of the female flower. You can pollinate your cucumbers by going out every morning with a small paint brush and transferring pollen from the flowers with no little cucumber to the flowers with a little cucumber. Next time, choose a hot house variety that doesn't need to be pollinated.

The root vegetables are cool temperature vegetables. If you are getting your tomatoes to set and your cucumbers to bloom, it means its just too warm for the other vegetables to grow.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Name: Elaine
Sarasota, Fl
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Jan 14, 2017 4:43 PM CST
I agree I agree with Daisy about pollinating the cucumbers.

Couple of other observations from your pictures - in the top picture it looks to me as if you have way too many plants crowded together in that planter. Thin out about half the plants, fertilize the others and they should put on more growth. They're competing with each other for all the food and water in there. If you're careful, you will be able to transplant the thinned ones to another planter, too. Or just eat them. Mm. Baby greens.

Second thing, you have those beautiful huge tomato plants right up against the wall of the greenhouse. Do your other planters get enough sunlight in there? Most veggies need at least 6 hours of direct sunlight to grow optimally.

Cool season veggies like your radish, kohlrabi and beets will still grow if it is too warm, ask me how I know, here in Florida where we've only had two short blasts of cool weather. But they probably will be tough and dry, not juicy and tasty. Next winter, plant the cool season stuff first, and bring along the tomatoes and cukes in December or January to grow through the spring. Keep the temps down in your greenhouse through the fall and I'll bet you'll get wonderful yields. But don't forget to thin to the right spacing.

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill

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