SEED VIABILITY

Bill Richardson ixia@dcsi.net.au
Sun, 27 Nov 2016 12:47:07 PST
Hi Jane,
This is an excellent post and I loved reading it.
I've had the same experience here in Australia. I've grown many species from
seed and the challenge is always there to germinate and grow the seedlings
on.
I germinated some Canna seed I collected in Queensland, after finding them
in a packet in a drawer, six years old with a near 100% germination rate.
Not all the info you read in books is correct, it is best to research the
species yourself, eg. Habitat, growing conditions etc and sometimes your
efforts with reward you immensely.
Thank you for posting this, I think it is the most sensible post I have seen
on here for ages.
Best wishes from Australia.
Bill Richardson
Ixiaking.

-----Original Message-----
From: pbs [mailto:pbs-bounces@lists.ibiblio.org] On Behalf Of Jane McGary
Sent: Monday, 28 November 2016 7:04 AM
To: Pacific Bulb Society
Subject: Re: [pbs] SEED VIABILITY

In recent years I've had quite a bit of experience sowing old, indeed very
old, seeds. Most had been stored in air-tight containers (e.g., glass jars)
in refrigerators. It was surprising to see what germinated, although not all
seedlings survived for more than a few months (perhaps because of the age of
the cellular components). There were even some startling results, such as a
single Celmisia from a packet more than 10 years old (it's still alive 2 1/2
years later, and this is the first time I've ever germinated a single one,
even from fresh seeds I collected myself).

People, including myself, who received seeds from the dispersal of a very
large seed bank accumulated over more than 20 years by Betty Lowry of the
Seattle area, have reported somewhat anecdotally on their results for an
article that is planned for eventual publication in the NARGS Rock Garden
Quarterly. I have also received long-stored seed from Gene Mirro and Ron
Ratko.

In general, species from particularly arid regions tend to have seeds with
long viability, as could be predicted. Among monocots, Calochortus and the
Themidaceae seem to do this. In proper storage conditions, Lilium seeds can
have very long viability (and I'd guess this also applies to Tulipa).

The literature on seed germination tends to make doctrinaire statements
about viability, and my personal experience makes me doubt some of those.
That experience also misled me into thinking, for instance, that Fritillaria
seed can't be expected to germinate after long storage -- yet I got very
good germination of F. conica (a desirable species) from the Lowry hoard.
You will read that certain genera must be fresh to germinate, but
observation tells us that within a genus there can be both short- and
extended-viability species; examples are Anemone and Erythronium. Some
authors write that all the Ranunculaceae are short-viability, but there are
definitely exceptions; for instance, I've raised several Delphinium species
from stored seed.

The conclusion I'd offer is that you should sow any seeds you have, perhaps
retaining a portion of those that are especially rare and desirable for
later use -- or sharing with other good growers. Indeed, sharing seeds with
others who may have different growing conditions or skills is the best way
to ensure that good plants remain in cultivation. 
Thus, I'm glad I sent part of my share of the Lowry seeds to Bob Nold in
Denver, Colorado, who was able to work successfully with some steppe species
I couldn't manage here in the Pacific Northwest.

Jane McGary

Portland, Oregon, USA







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