Yes. A fan does help immensely with making strong stems. the constant movement makes the stem cells break from the movement and repair themselves to make a sturdier stem. I have a HAF fan in the greenhouse which runs continually.
and for those who don't run ,a fan just brushing your hand over the tops of the tomatoes several times a day provides a similar benefit. it also makes you happier to smell the tomatoes.
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carolyn k
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