Biodegradable peat pots made of Canadian sphagnum peat moss permit abundant aeration, uniform drainage and easy root penetration. Transplant shock is greatly reduced because the entire pot can be planted with the seedling when roots show through the wall. Pots indicate need for water by turning light brown when dry. The 4" pot is 4" w x 4" ht. For sustainable alternatives, see also our Coconut Fiber Pots & Pellets.