When the plants get too big for the shells, you can transplant them straight to the soil, shell and all.
Step 1: Materials
Potting soil & spoon
Awl/needle/pin - anything long and sharp
Pot & stove
Egg cups/miniature clay pots for display
Step 2: Prepare the eggshells
1. Carefully crack the top third of the egg. You can do this by tapping the egg on the edge of a bowl, or tapping with a sharp knife.
2. Empty out the eggshells completely.
3. Wash the eggshells out well.
Optional step: If you are concerned about salmonella on the eggshells, put the empty eggshells in a pot of boiling water for a few minutes.
Step 3: Add drainage
This hole provides drainage, so the roots of your plant don't drown. You only need to poke one small hole; more than one might crack the shell.
Step 4: Add potting soil
Optional: If the potting soil is dry, spray it with water from a spray bottle as you fill the eggshell.
Step 5: Add seeds
If you want quick results, try beans or cucumbers - they usually sprout in a few days.For bonus points, use seeds that you saved from last year's crop instead of buying seeds. Oh my goodness, seeds are AMAZING!
Step 6: Enjoy!
Carton: After you have planted the seeds, you can simply put the eggshell planters back into the carton. The carton provides a stable base with room for drainage, is freecycled and looks cute.
Clay pots: You can get miniature clay pots, or use eggcups to display the planters.
Mini Greenhouse: If you want to keep your seedlings extra snug and promote faster growth, you can make them a greenhouse out of a pop bottle.
Step 7: Care for your plants
When the plants grow too big for the shells, gently crack the shells and plant them straight into the garden or a bigger pot. The shell will eventually biodegrade, and the roots will grow out of the shell. The shell also supplements the calcium in the soil.