[SOS-PCA] Fw: [EXTERNAL] FW: When is Poa secunda ripe?

Tue May 12 09:38:44 CDT 2020

Hi all, forwarding a note from Bend.

--
Leah Prescott
Seeds of Success
National Collection Curator (Contractor)
202-912-7232

Seeds of Success<https://www.blm.gov/programs/natural-resources/native-plant-communities/native-plant-and-seed-material-development/collection>
National Seed Strategy for Rehabilitation and Restoration<https://www.blm.gov/programs/natural-resources/native-plant-communities/national-seed-strategy>
Plant Conservation Alliance<http://www.plantconservationalliance.org/>
________________________________

From: Garvin, Sarah E -FS
Sent: Monday, May 11, 2020 9:15 AM
To: Sarah De Groot <sdegroot at rsabg.org>; SOS at lists.plantconservation.org
Subject: RE: [SOS-PCA] When is Poa secunda ripe?

Hi Sarah,
We have not ever seen evidence to support the idea that seed ripens after it is collected.  We have received multiple green collections of Poa secunda (along with other grasses) and they generally result in a lower yield with a large amount of desiccated seed.  This result doesn’t change depending on how much stem material is included. It is hard to know on our end whether collectors are hoping for “after-ripening” with these collections, if they are unsure of how to judge maturity, or if they are just collecting opportunistically without being concerned about optimizing maturity.

I haven’t personally collected Poa secunda, but any seed that shatters easily from the stem is almost certainly mature.  This is partly why we recommend stripping seed rather than cutting the stem.   We totally understand the need to cut stems but ask that they be kept to less than 6 inches so they will pass through processing equipment easily.  If stems are cut, take into account that yields will be lower so you may need to collect more raw weight to compensate.

Curious if anyone has a different opinion or experience with this topic.  The question comes up all the time!

[Forest Service Shield]
Sarah Garvin
Assistant Manager
Forest Service
USFS R6 Bend Seed Extractory
p: 541-383-5646
f: 541-383-5498
sarah.garvin at usda.gov<mailto:sarah.garvin at usda.gov>
63095 Deschutes Market Road
Bend, OR 97701
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Caring for the land and serving people

From: SOS <sos-bounces at lists.plantconservation.org<mailto:sos-bounces at lists.plantconservation.org>> On Behalf Of Sarah De Groot
Sent: Monday, May 11, 2020 8:20 AM
To: SOS at lists.plantconservation.org<mailto:SOS at lists.plantconservation.org>
Subject: [SOS-PCA] When is Poa secunda ripe?

Hi Seed Collectors,

Can anyone offer advice on how to tell when Poa secunda seed is ready to collect? I assume that if the inflorescence is falling apart that it's probably dispersing and therefore ready, but can it be picked any earlier than that? Does it after-ripen at all? Should I be stripping inflorescences in the field or taking whole ones? I was guessing Bend would want them stripped, but does that affect ripening?

Thanks for any information you have!

Sarah De Groot, Ph.D
Field Botanist, Seeds of Success Coordinator (CA930A), GIS Technician, and Research Associate
Plant Conservation Department
California Botanic Garden/Rancho Santa Ana Botanic Garden (RSA-POM herbarium)
Claremont, California, USA
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***Please pardon delayed replies; I might be in the field***

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