how long for marigold seeds to bloom
1 Though they grow in almost any soil, marigolds thrive in moderately fertile, well-drained soil. 2  Sow them directly into the garden once the soil is warm, or start seeds indoors about a month to 6 weeks before the last spring-frost date.3  The seeds germinate easily, but watch out for damping off if you start them inside.hen fertilize lightly with a balanced plant food. It may take a week or two for the marigolds to recover but they should be fine. Next year, if you grow marigolds, you really want to pinch or cut back the new buds and foliage tips when they are 6 to 78 inches tall.
1 Marigolds need lots of sunshine. 2  Though they grow in almost any soil, marigolds thrive in moderately fertile, well-drained soil. 3  Sow them directly into the garden once the soil is warm, or start seeds indoors about a month to 6 weeks before the last spring-frost date.hen fertilize lightly with a balanced plant food. It may take a week or two for the marigolds to recover but they should be fine. Next year, if you grow marigolds, you really want to pinch or cut back the new buds and foliage tips when they are 6 to 78 inches tall.