At least the compost component of my potting medium is sustainable. Two 32-gallon trash cans of my own compost remain from the years when I used to religiously gather, shred, and tumble plant material from my own yard. Any pest bulbs, such as Oxalis pes-caprae or the Nothoscordum gracile, which I struggle to eradicate, ever came near my compost tumbler. I see both abundantly growing around the neighborhood and know for certain that those go into our city's green waste and on to the compost. Sure, 99% gets killed in the composting process. But it only takes one tiny bulblet to repopulate the menace. I was even careful not to use leaves swept from the area where the green waste cans were tipped into the truck, since I've seen noxious plant material spill out. I stopped producing my own compost when my ComposTumbler broke. (One end broke, the other end fine. If anyone knows of another half-broke I'd love to buy it for parts. The original 168 gallon model, not what is sold now.) Now that it is in limited supply, I only use my own compost for important situations, such as potting mix or new bulb boxes. I use Happy Frog brand bagged organic compost for top-dressing in-ground plantings. Its moisture-retaining and draining properties are very different from my own compost. Mine retains less water and drains faster. My sifted compost is closer to the bagged product in those respects. _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net https://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> PBS Forum https://…