Q.growing cosmos
How deep should the soil be for growing cosmos. If I plant them in a large box that is only 4″ deep will the cosmos survive by spreading roots horizontally?
Downtoearthdigs
Answered on May 17, 2018
You may want to have a container that is closer to 8" in depth for Cosmos.
https://www.gardeningknowhow.com/ornamental/flowers/cosmos/growing-cosmos.htm
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