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What is the secret to full, lush zinnias from seed?

last month

Grown from seed under lights, I should say. For the life of me, try as I might, I just cannot get full, lush transplants like you see for sale in the nursery. I do pinch, all that seems to accomplish is a couple more branches off the main stalk but they're still long. I keep the lights close to the plants, and I don't have a leggy-ness problem with other plants. Fertilized with Dyna-Grow at 1/2 strength at least once a week (sometimes more). These are tall varieties of zinnia, BTW. For comparison, my tall variety of marigolds look stellar this year. Can't figure out what the trick is with zinnia - ?

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