I use the smallest ones. 120 sponges. I order two packs at a time to save a little on shipping and then have a two year supply. It does come out to 15-20 cents a sponge, but well worth it to me when you have such a short time to plant for spring bloom. Up north, unless growing inside, they might not be as appealing, as it takes awhile for bloom anyway.
Very very good to see you again!
