Pumpkin Center, Kern County, California. This article is about the unincorporated community in Kern County. For the unincorporated community in Lassen County, see Pumpkin Center, Lassen County, California.
Harvesting Chestnut Trees. After the chestnuts fall from the tree, watch for the spiny burs to split. Donât harvest chestnuts if the burs are still green and closed because the nuts inside will be unripe. Harvest the nuts every couple of days.
Step 5. Make your own seed starting mix for horse chestnuts by mixing compost and potting soil together to make a 50/50 compost/soil mix. Moisten the compost/soil mix with water and fill the 1-inch pots to the top.