I grew all 3 last year but direct sowed the nasturtiums outside at start of May. I didn't have space for all the Nasturtiums and Marigolds in cells. I set them out during the day as long as temps were above 40. I brought them in at night and put back under lights until bedtime. I planted outside at start of May last year here in Pennsylvania. Good thing you got a jump on the Petunias. They were very slow germinators and took awhile to get growing. Good luck!
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-Frank
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