Skip to Main Content
An index of ripeness for sugar pine seedAuthor(s): H.A. Fowells
Source: Res. Note 64. Berkeley, CA: U.S. Department of Agriculture, Forest Service, California Forest and Range Experiment Station. 5 p
Publication Series: Forest Research Note
PDF: View PDF (571.39 KB)
DescriptionImmature or unripe seed may be one cause of the poor germination of sugar pine occasionally experienced in nursery practice or direct seeding projects. Ripeness of pine seed, or the time to harvest cones, is usually judged by a change from green to brown in the color of cones or by the development of a firm consistency in the endosperm. However accurately these criteria may be applied, they are subjective and cannot be described well enough to permit consistency in their use. This paper describes an index of ripeness for sugar pine seed.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationFowells, H.A. 1949. An index of ripeness for sugar pine seed. Res. Note 64. Berkeley, CA: U.S. Department of Agriculture, Forest Service, California Forest and Range Experiment Station. 5 p.
- Sugar pine seed harvest by Clark's nutcracker: Annual use of a transient resource in Crater Lake National Park, Oregon
- Artificial ripening of sugar pine seeds
- Site preparation as an aid to sugar pine regeneration
XML: View XML