Cosmos Flower Growing Season. The annuals are particularly effective when massed and provide flowers for cutting over a period of months. Cosmos usually germinates in 7 to 12 days and bloom after 50-60 days.
Cosmos will bloom constantly from late spring until fall if given just the slightest bit of care. Jun 29 2020 Although cosmos seedlings are readily available in plant stores growing cosmos from seeds is very simple and straightforward so theres no need to splurge and buy nursery cosmos plants. Although nursery seedlings are available cosmos are so easy.
Mar 03 2019 Theyre quick and easy to grow from seed flowering in as little as 12 weeks and can be added to borders and pots for a burst of showy colour.
Deadhead to prolong flowering and lift in autumn after the first frosts. If you let the spiky-brown seed heads blow away during the fall. May 18 2021 If you are growing cosmos from seeds be mindful that it takes about 7 weeks to first bloom. Inch deep 14 to 18 inches apart.