Did you know that by adding 4” of mulch over 1000 square foot of soil will help your garden hold onto an additional 10,000 gallons of water.
El Corazon/Agriservice, 3210 Oceanside Blvd. Oceanside, CA 92056 – free if you are an Oceanside resident, about $12 for a pick up truck’s worth, delivery available
Miramar Greenery, 5180 Convoy Street, San Diego, CA 92111 (Miramar / Kearny Mesa) – up to 2 cubic yards of 4” mulch free if you are a City of San Diego resident
Tree Trimmers offer free mulch
Or approach your local tree trimmer and ask.