African marigolds (Tagetes erecta) Also called Mexican marigold, this is the big one. It grows up to 4 feet tall and has pom-pom type flowers in shades of yellow and orange and near-white.
French marigolds (Tagetes patula)
These are short, only 6 to 12 inches tall. Flowers often come in two tones: shades of yellow and russet or orange. When turned into the soil at the end of the season, French marigolds are said to deter nematodes in the garden.
Signet marigolds (Tagetes tenuifolia)
The signet marigold doesn’t look a lot like the typical marigold and is a little more difficult to find. Luckily for gardeners in rural areas, these marigolds are rabbit and deer resistant.
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