Can I start seeds in egg cartons?

Egg cartons can be a convenient option for germinating seeds, but to use them effectively, they must be managed carefully. They have shallow compartments that work fine for initial germination, but will limit root growth. Knowing the right way to use them starts with understanding how to prepare for a smooth transition before moving seedlings into deeper containers.

Prepare your cartons before planting as follows. Cut the lids off to optimize light availability. Make drainage holes in the bottom of each compartment using a nail or an awl. Fill each compartment with moist seed-starting mix, leaving 1/4 inch of space at the rim. Avoid compressing the soil so that the air pockets remain intact.

Regularly check moisture levels. Small cells will dry very quickly under lights, usually within hours. If using a spray canister to water, do so sparingly to avoid disturbing the soil. Set the cart into a shallow tray for bottom watering once it has adequately rooted. Cover with plastic wrap until germination.

Transplant immediately before roots hit the bottoms of cartons, usually within 10-14 days. Carefully cut apart the compartments with scissors, minimizing disturbance to the roots. For biodegradable egg cartons, plant the entire cardboard section. For plastic-lined cartons, carefully tilt and slide the soil blocks out, keeping the roots intact.

Learn how to select the best crops carefully. Herbs such as basil and cilantro grow well in cartons at the outset. Avoid using deep-rooted crops, such as tomatoes or peppers. Flowers such as marigolds do well in the short term. Be sure to check the roots after 7 days for signs of binding that require immediate transfer.

Read the full article: When to Start Seeds Indoors: Ultimate Guide