I noticed that most seed trays are black. Is there a reason for that? Does the black plastic absorb the heat in the greenhouse better!
I enjoy fishing ,gardening and a solar greenhouse! carpet installation repair and sales for over 45 years! I am the inventor of the Bobber With A Brain - Fishing Bobber!
No practical reason. The soil mix is dark so that masks any color of the plastic. Larger containers (gallon pots on up) are a diffent matter in that the sun can hit the sides and warm them up, but they are often grown outside by nurseries.