Often zinnias are started in 4- or 6-celled pots, and our 1½" biodegradable pots also work well. Nearly any clean container with drainage holes will work. It is better to use a weak fertilizer solution more frequently rather than to over-fertilize. If your seed starting mix does not contain nutrients, feed seedlings regularly with a balanced (equal parts nitrogen, phosphorus, and potassium), liquid fertilizer. By thinning early, you minimize the negative impact of crowding, like stretching for light. The strongest plant may not be the tallest look for thick, strong stems and deep color, too.
Sow two seeds per pot, thinning to the strongest plant once leaves appear (clip extra plants at the soil level using scissors). Use a lightweight seed starting mix/media (sterile, and lighter than potting mix), and sow seeds 1/4" deep.
Zinnias do not benefit from being planted early wait for warmer weather. When to start inside: 4 to 6 weeks before your average last frost date. The ideal soil temperature for zinnia seed germination is 70°–80☏. 1 to 2 weeks after your average last frost date.
Zinnias bloom heaviest when daylight is less than 12 hours. Zinnias are native to Mexico and as a frost-sensitive annual appreciate warm weather.
#Zinnia flower seedlings how to#
If you were wondering how to grow zinnias from seed, you've come to the right place! They bloom effortlessly from summer to frost and the more you cut, the more they branch and bloom. Zinnias are the star of the summer flower garden, loved by novice and expert gardeners.
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