Zinnias are annuals, so they'll grow for one season and produce seeds, but the original plant will not come back in subsequent years. They have bright, solitary, daisy-like flowerheads on a single, erect stem, which makes them great for use as a cutting flower or as food for butterflies.

Seeds from open-pollinated plants, though, will grow true to the parent plant, so it makes sense to harvest those seeds. The following zinnia varieties are open-pollinated, meaning they will grow to look the same as the parent plants from which their seeds came: Green Envy. Cactus Bright Jewels.

After all danger of frost, sow Giant Cactus Flowered Mixed Colors Zinnia seeds in open ground well exposed. Or, for earlier bloom, start indoors about 4 weeks before the last frost. Cover with 0.25" of soil. When the plants are 3" high, thin or transplant.

Zinnias typically take around 2 months from seed to flower, although this can change depending on weather conditions. Here are some additional tips to grow zinnias: Choose a bright and sunny spot for your zinnias. Cover zinnia seeds with just ¼ inch of soil because they need light to germinate.. . . . .364011233884!]0000000000000009783314147376!]