Cosmos Flowers

Growing Cosmo Seedlings Indoors


caitlinnnq10 added on April 8, 2018 | Answered

I live in New York and have no choice but to keep my cosmos inside until about may 15th when danger of frost passes. I originally had the cosmos in small seed cells, but once roots stuck out I moved them to 3 inch pots. They are growing way slower than they did in the cells and it’s been almost a week since transplant. I’m very new to gardening so what I’m really wondering is what should the next step be.. Are these seedlings going to be able to stay in 3 inch pots for long? Is it normal for there not to be much growth after transplant? Also, when they are full grown what is a practical pot height for these cosmos? Do their roots grow very deep in soil? If anyone can help I appreciate you so much. Just want to know the best way to grow these beauties.


Share this Question:
Log in or sign up to help answer this question.
Check here if you would like to receive notifications every time this question is answered.
You are subscribed to receive notifications whenever this question is answered.
ANSWERS
MichiganDot
Answered on April 8, 2018

A sulking plant is common even a week after transplant. Cosmos are known not to like this disturbance which is why some gardens feel there is no advantage to starting them indoors. Keeping them in a cool environment with minimal fertilizer and adequate supplemental lighting will help keep them from outgrowing their 3 inch pots. Tall cosmos, over 4 ft, are not appropriate for containers and are likely to flop. All plants in containers develop deeper roots since lateral spread is contained. A 10-12 inch container for each 3-4 ft. cosmos should be enough.

Was this answer useful?
10
Looking for more?
Here are more questions about Cosmos Flowers

You must be logged into your account to answer a question.

If you don't have an account sign up for an account now.