There are almost as many ways to clean seeds as there are species that produce them. This is primarily due to the great diversity of fruits that contain them. Some seeds are easier to clean than others. Fireweed (Chamerion angustifolium) is one that requires several steps. The degree or extent of the cleaning process should also be addressed. The Seed Bank requires seeds to be cleaned to the extent that all viable seed in a collection are retained.
Restoration Collection target species lists have been recently updated for the 2018 collecting season!
The Dixon National Tallgrass Prairie Seed Bank collection priorities are reflected in our Restoration Species target list, comprising 545 species characteristic of native habitats in the tallgrass prairie region. The goal is to collect seeds of each species from one population in each of the 12 ecoregions represented in the tallgrass prairie.
We are looking for botanists throughout the Midwest and Great Plains to help us reach our goal! A stipend will be awarded for each collection on the target list made on our behalf and we also cover shipping costs.
Since storing seeds of native plants long-term in seed banks is a relatively new idea we can only guess at their longevity under these conditions. It is necessary to test seed accessions periodically for viability by germinating them. Germinating seeds that have been stored cold and dry can be problematic, especially for those species that are difficult to release from their dormancy. Fortunately, the Dixon Seed bank has many duplicate accession at the Millennium Seed Bank in the UK where seeds are systematically checked for viability. We have performed some test on seeds that were not sent to the UK and some of the results of those tests are described in the attached report.
For many species in the tall grass prairie region, their populations are small and the goal of a minimum of 3000 seeds per collection is difficult, if not impossible, to meet. However, the conservation of these species is just as important as other species that can easily be collected at these numbers. We have established new collecting protocols so that these "difficult" species can be collected without compromising the genetic diversity of the collections. These protocols have changed slightly since this news item was first posted.
Although seed preservation is an important part of seed banking, seed collections are not locked away indefinitely. A portion of each seed collection is available for selected conservation projects and potential germination testing to monitor the viability of our seeds over time.