Hi all, In the past I have used Park's Starts for seed starting. I love them, no complaints. However, I have about 2,000 seeds to start and I decided to try the 'flat' method. Since I don't want a flat of each (there isn't that much open ground in Southern CA anymore), I bought some half flats (11" x 11") from Charlie's. These come each with a clear cover (to retain humidity) but no holes in the bottom of the flats. I hate to admit to such abject stupidity (probably comes from washing too many dishes) but it is what it is: Some flats have holes and some don't. I never did understand this distinction. Do I only need to punch some holes in the flat bottoms if I intend to water from the bottom (from a tray or mat)? Are the flats w/o holes for people who top-water? Thanks! Cathy Craig President PBS Maritime zone 9b