Michigan State University Extension
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There are two basic types of marigold; the tall, large flowered African Marigold and the shorter, smaller flowered French Marigold. Provide a fertile soil and at least six hours of sun. Marigold holds up well during the hot summer days if watered properly. Even large plants may be transplanted if enough of the root system is dug up. Too much watering may cause dwarf types to rot. Too much nitrogen or shade causes leafy plants with few flowers. Marigolds may be used as a dried flower and are planted 10 to 14 inches apart.
The seed germinates in one to two weeks at 70 to 75 degrees. If the growing area is too hot the plants become leggy. When transplanting set the plants a little deeper.
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