Plant Parenting: Use Coir to Increase Humidity for Seeds

June 10, 2020

Maintaining proper moisture is key to successful germination and healthy seedlings. The growing media should always be damp to the touch, like a wrung-out sponge. Never let it dry out, but don't let it stay too soggy either.

A new seeding of peas topped with coir.
PC: Leslie F. Halleck

One trick to maintaining even moisture as seeds germinate and keep the surface of the soil from drying out is to sprinkle a thin layer of a material such as coir or vermiculite on top of the soil. I prefer to use coir. These materials will hold additional moisture, which can help prevent your seeds from drying out before they germinate.

Coir after it has been rehydrated.
PC: Leslie F. Halleck

Coir is a lightweight material made from the byproduct of coconut husks. It absorbs and holds water, while aerating the soil. Coir typically comes in a compressed block that you soak in water to rehydrate. After it soaks up water, coir becomes light and fluffy.

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