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.
When to harvest chestnuts? Chestnuts donât ripen at the same time and chestnut harvest time can span as much as five weeks, although the nuts generally ripen in a 10- to 30-day span of time in late August and September. Allow the nuts to fall from the tree naturally.
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.