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.
If the site has not yet been harvested: 1  Spray small understory trees and shrubs with a herbicide in late summer. 2  Harvest merchantable trees during winter. 3  Cut down or girdle all nonmerchantable trees and spray herbicide on their stumps or girdles to prevent resprouting. 4  Plant walnuts in spring.