Great idea! ;) They also work as cutworm collars around flowers and vegetables and as seed germinating containers inside.

Dave

I like using TP rolls, too, but be aware that the top parts exposed to the air wick moisture out of the soil and away from the plants. If you don't mind paying close attention to the plant's moisture needs, no problem.

I plan to use some TP rolls this year, too. I am going to fill each TP roll with potting mix, stand them on end in shoeboxes, and plant Parsnip seeds in them. Then in summer I will plant the TP roll/parsnips directly into the garden. (Parsnips are tricky to grow here because of our short summers).

I don't know for sure if it will work, but it's worth a try.

Beware of mold, I've never done this personally but have seen it done and mold was almost always an issue.