How long does it take for zinnias to bloom. Buds form rapidly along the vegetation and flowers begin to unfurl depending on the variety 50 to 70 days after you sowed the seeds. Zinnias are classified as tender annuals which means you should wait until all danger of frost has passed before sowing zinnia seeds. To start zinnias from seed indoors or outside poke the pointy end of the seed into the soil and then cover it lightly with soil.
On average it takes about 60 days for the plant to start blooming. They dont tolerate frost though so wait until nighttime temperatures are at least 50 degrees fahrenheit to. Deadheading spent blooms promotes additional flowers and the blooms.
Zinnias bloom from april to november. Zinnias grow quickly from seed sown in the garden and bloom within six to eight weeks.
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Zinnia University Of Florida Institute Of Food And Agricultural Sciences
gardeningsolutions.ifas.ufl.edu