Vegetables and Fruit forum→Growing Spinach Indoors under grow lights

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Name: Thomas Mitchell
Central Ohio (Zone 6a)
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thommesM
Jun 12, 2020 11:58 AM CST
So I've started all types of plants, tomato, pepper, eggplant, squash, brassicas indoors. I also grow lettuce 100% indoors under LED grow lights. Lettuce does well for the most part. I tried growing spinach and it sort of gets stemmy or goes to seed very quickly. Doesn't get large leaves at all. I've tried different varieties and same thing.

Has anyone tried growing spinach for harvesting under led grow lights and had success?
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ElPolloDiablo
Jun 13, 2020 2:53 PM CST
Spinach usually bolt (go to seed) when days start getting longer and temperatures become warmer in the Spring. According to my dated book here they start to flower when days last at least 14 hours and temperatures are over 75F.
Cool season cultivars tend to get taller and and with few leaves, exactly like you saw.

What to do? You can t-r-y one of the bolt-resistant cultivars developed over the past decade: they will bolt eventually, but will do so later in the season. According to literature the two most bolt-resistant cultivars are Spinner and Correnta.
Another thing to do is to try and keep temperature and lighting under control. If you can keep temperature under 80F or so you have good chances of success with one of the bolt-resistant cultivars. You should also set the grow light timers to provide an even 12 hours of light and darkness every day.

That's all I can think of: I've never had much success with grow lights myself.

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Name: Thomas Mitchell
Central Ohio (Zone 6a)
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thommesM
Jun 13, 2020 4:21 PM CST
That's interesting! Never would have thought too much light would trigger a plant to bolt. The temperature is not a problem. However, I do leave the lights on at lot longer than the 12 hours. Lettuce doesn't really care how long the lights are on. I have good luck with various lettuces, bok choy, and radishes. I'm trying baby carrots now for the first time. Tops are growing well, will have to see if the root forms. I'll start another batch of spinach and set the timer for 12 hours. Thanks for the advice.
Everyone has something they can teach; everyone has something they can learn.

"America is the most grandiose experiment the world has seen, but, I am afraid, it is not going to be a success. "
— Sigmund Freud

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