Leggy seedlings in hot climate

enoughcliches(Tropical)September 24, 2007

This is my first time growing seedlings indoors under lights (and also my first time growing anything from seed, other than sunflowers). My impatiens are nice and stocky, but the zinnias look a little long while the cosmos are just terribly leggy. I suppose the hot climate in my country has something to do with this (80 degrees indoors during the day is typical here). I read that bluer wavelengths help with the legginess. Should I be getting some "cooler" fluorescents or simply try to increase the light intensity as much as possible?

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shrubs_n_bulbs(z8/9 UK)

Impatiens are, more or less, shade plants. They will remain compact even in quite low light. The Zinnias and Cosmos are the opposite, they get leggy even in full sun in England. Even perfectly healthy plants are tall. The answer, as always, is more light. And more of the light you already have concentrated onto the plants. "Cooler", higher kelvin temperature fluorescents should theoretically produce more compact plants but I haven't seen a difference.

    Bookmark   September 25, 2007 at 3:08PM
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Thanks for the heads-up on natural growth habits. I already have the seedlings growing under 3 2-foot fluorescent fixtures, so I guess concentration rather than amount is the main issue here (I didn't know which colour to use so I got all 3!). Perhaps I started them a little too far away from the lights :)

    Bookmark   September 25, 2007 at 8:45PM
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