Demystifying Wild Seed Collection

by Lauren Berger and Jake Picardat, February 2025

If you look into a seed collectors bag you’re likely to find: a handful of paper lunch bags, masking tape, sharpies, a local dichotomous key, hand lenses, and small blades for making precision cuts. From summer into fall, these tools will be used in identifying, dissecting, and eventually collecting seeds.

Since 2012, the Institute for Applied Ecology has housed a seed collection crew operating with the specific goal of collecting wild seed from native plants across Oregon. Year after year, our seed collection efforts continue to grow in range and focal species list. In 2024, crews based out of our Northwest office scouted for plants in 14 separate counties throughout the state. This widespread effort resulted in 90 separate collections from 58 species. These collections are fundamentally important to growing and banking the wild seed seed necessary for restoration and conservation efforts across the Pacific Northwest.

But what goes into the process of wild seed collection? The scope of our work has allowed our seed collection teams to gain pertinent insights into the fundamental principles that lead to successful collection outcomes. With the National Native Seed Conference taking place in Tucson this month, we wanted to take the time and opportunity to help demystify the seed collection process.


Determining the Whos, Whats, and Wheres of Wild Seed Collection in Oregon

1. Focal species selection

Before collection efforts begin, the seed collection team coordinates with restoration ecologists, seed growers, land managers, and federal and state agencies to determine which species are appropriate for restoration goals and conservation needs.

2. Scouting Points

Once a target list is created, collectors must determine species occurrence. Multiple methods exist for properly determining scouting points. Collectors work to build relationships with land trusts, federal, state, and tribal agencies, and private landowners. Utilization of local databases like Oregon Flora, citizen science websites like iNaturalist, and local botanists offer valuable leads.

3. Land Permissions

Seed collectors at IAE must obtain appropriate permissions prior to any scouting. Government entities, local organizations and private landowners are considered in the permitting process. Collectors record all activities that were conducted at sites and focus on building resilient and purposeful partnerships at collection sites.

Species targeted in 2024 included Tolmie’s mariposa-lily (Calochortus tolmiei), Pearly everlasting (Anaphalis margaritacea), and Fireweed (Chamaenerion angustifolium).

A Plant’s Potential: Is it Here?

Once collectors have set their eyes on a location, the boots-on-the-ground work begins. At the onset of the scouting process, we determine whether or not our target species are present, accessible, and occurring in numbers appropriate for sustainable collection.

This step in the process requires long travel days, hiking, navigation, and strong skills in plant identification. Sometimes, crews are working with population points that haven’t been verified in years. Populations may have disappeared due to environmental factors, or a promising lead may turn out to be a lookalike. The pre-collection scouting process is crucial as it allows collectors to confirm a plant’s presence and record important site information.

Assessing Plant Phenology and Collection Possibility

This part of the process is often integrated with the scouting phase, but in many instances phenology assessments require multiple site visits. Collectors consult records, collaborate with other collectors, reach out to those who frequently access sites, and monitor species phenology through iNaturalist.

Crews estimate how many plants are vegetative, emerging, flowering, have green or ripe seed, or have already dehisced. Estimating when to return to collect a species is the most nuanced and important part of a successful collection.

The photos below display 3 of the phenology checks that were made on a population of Castilleja hispida before a collection was completed. Based on internal IAE records, this species was collected previously on July 13, 2021 but most recently sufficient collections were unable to be completed until August 12, 2024.

Phenology checks made on Harsh Paint Brush (Castilleja hispida) at Horse Rock Ridge.

Collection Begins

Once all preparations have been made and scouting has been completed, field crews will begin returning to sites to attempt collection. This process may take multiple visits either to time ripeness accordingly, or to collect from indeterminate species over multiple days for highest seed yield. Returning for a collection may reveal unanticipated challenges, such as pest predation, pathogens, or other environmental factors that lead to unfilled seed.

Our collection teams are fond of using paper bags and hands to collect, but we also utilize hand snips and mesh bags that can be tied around plants to capture seeds before they drop.

Seed collection from Wayside Aster (Eucephalus vialis), Broadleaf Lupine (Lupinus latifolius), and Harsh Paintbrush (Castilleja hispida).

Wild Seed Cleaning

Wild seed cleaning presents unique challenges, yet has low barriers to entry! In places like the Willamette Valley where collection takes place in such small areas, collectors often acquire only a paper lunch bag worth of seed. This leaves seed cleaners with only a small amount of material to clean, but an increased awareness of the need to try and save every seed possible.

Before beginning cleaning, it’s important to ask: what the seed will be utilized for? Will it be returned immediately back to the landscape, used for grow outs, or put into long term storage for seed banking? These considerations ultimately determine how much chaff and inert materials need to be removed. IAE aims to get seed as clean as possible utilizing tools like the air density separator pictured below to blow out light chaff and unfilled seed.

The air density separator.
Pods from Tolmie’s Mariposa-lily (Calochortus tolemiei).

Acknowledgements

Our seed collection is supported through multiple partnerships including those with the Bureau of Land Management, United States Forest Service, United States Fish and Wildlife Service, Oregon Department of Agriculture, Oregon Watershed Enhancement Board, and Oregon Department of Fish and Wildlife.