Tired of paying for crappy Jiffy Pots for your seedlings? I was! So, last Spring I decided to make my own starter pots for them.
Step 1: Materials
For each 12"x18" tray (3" deep), you will need:
* a 12"x18" cardboard box (or a piece of cardboard 18"x24", to make the tray)
* duct tape
* half of a garbage bag (at least 18"x24" in size)
* 24 coffee filters (I bought unbleached, but it really doesn't matter much)
* potting soil. You will go through a surprising amount of this. Hypothetically, you will use 0.4 cu. ft. of soil per tray, but they usually sell it by weight, not volume (which means they sell it as wet as possible, to rip you off!).
Some scraps from the box will also be used to make the two positioning guides, which can be reused from tray to tray.