Lily Stratification

Gene Mirro mirrog@yahoo.com
Tue, 14 Feb 2012 10:51:12 PST
Richard, your photos show a small percentage of germinating seeds.  But in 
your message, you say "All have begun putting out a radical".  Your 
stratification times of "30 days at 50 deg f then the last 2 weeks at 40 deg 
F" seem very short to me, and 50F seems quite cold at the beginning of the 
process.  I usually allow at least a couple of months of cool stratification 
in Fall and early Winter,  starting out at around 60F, followed by at least 
three months in Winter at 35-45F.  If you shorten these times, the percent 
germination will go down, and some of the seeds will not germinate until a 
year later in Spring.  I try to get as many as possible to germinate in the 
first Spring, since the ones that come up in the second Spring seem to be 
weaker, maybe due to reduction of their stored food supply.

Since you are seeing signs of germination, I think you should move them to 
flats and cover with 1/4" of mix, and continue cold stratification. 
Otherwise, you run the risk of damaging the radicals later on.

This last Summer, I tried sowing some NW native lilies in late July.  The 
Summer was quite cool this year, and root germination seems to be very 
strong.  No leaves yet though, except for L. humboldti, which always emerges 
very early.  However, I have had bad results from early sowing in hot 
summers, so I usually wait until September to sow.  Also, I don't like to 
handle the germinated seeds, so I sow them directly into the containers 
where they are going to grow.

When the leaves emerge, it is crucial to grow the seedlings cool.  No 90 
degree greenhouses!  The higher the temp, the higher the mortality.  If 
growing in containers, it can be very difficult to keep these plants alive 
in mid to late Summer because of high soil temps, even though they may have 
gone dormant by then.

----- Original Message ----- 
From: <pbs-request@lists.ibiblio.org>
To: <pbs@lists.ibiblio.org>
Sent: Tuesday, February 14, 2012 9:01 AM
Subject: pbs Digest, Vol 109, Issue 26


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> Today's Topics:
>
>   1. Need identification (Joseph Kraatz)
>   2. Re: Need identification (Alberto Castillo)
>   3. OT/ PBS contributor's tragic loss (Youngs)
>   4. Re: OT/ PBS contributor's tragic loss (The Silent Seed)
>   5.  Need identification (AW)
>   6. Winter Projects (Richard)
>   7. Lily Stratification (Richard)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 13 Feb 2012 13:16:25 -0800
> From: Joseph Kraatz <plantnut@cox.net>
> Subject: [pbs] Need identification
> To: pbs@lists.ibiblio.org
> Message-ID: <5C712669-FC8E-420A-ACF8-1A89736609A5@cox.net>
> Content-Type: text/plain; charset=us-ascii
>
> A friend gave me a handful of Oxalis bulbs of which she didn't know the 
> species.  They are now blooming but need help in identifying the species. 
> Thanks,  Joe, Oceanside, CA.
>
> http://flickr.com/photos/oceanside2012/…
>
> ------------------------------
>
> Message: 2
> Date: Mon, 13 Feb 2012 21:30:38 +0000
> From: Alberto Castillo <ezeizabotgard@hotmail.com>
> Subject: Re: [pbs] Need identification
> To: Pacific Bulb Society <pbs@lists.ibiblio.org>
> Message-ID: <BAY156-W5155DCDDD53C5236B3CA72AE7F0@phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
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>
> You have obtusa and brasiliensis there so far.
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 13 Feb 2012 23:02:56 -0000
> From: "Youngs" <youngs.aberdeen@btinternet.com>
> Subject: [pbs] OT/ PBS contributor's tragic loss
> To: <pbs@lists.ibiblio.org>
> Message-ID: <44AE7AADF91D45FC9A7E1059CF95836E@userfba71dce46>
> Content-Type: text/plain; charset="windows-1252"
>
> PBS members must be greatly saddened to hear, as we have been in the UK,
> of the death of Michelle Avent, wife of PBS stalwart Tony Avent of Plant 
> Delights Nursery Inc.
>
> A touching tribute to his wife and partner by Tony is paid  here : 
> http://plantdelights.com/February/products/…
> Our thoughts are with Tony at this sad time.
>
> M & I
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> Message: 4
> Date: Mon, 13 Feb 2012 18:13:07 -0500 (EST)
> From: The Silent Seed <santoury@aol.com>
> Subject: Re: [pbs] OT/ PBS contributor's tragic loss
> To: pbs@lists.ibiblio.org
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>
> I just learned of this this evening - very sad indeed.   My heart goes out 
> to Tony and his family.
> Jude
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 13 Feb 2012 19:42:09 -0800
> From: "AW" <awilson@avonia.com>
> Subject: [pbs]  Need identification
> To: <pbs@lists.ibiblio.org>
> Message-ID: <E59842C712E54E7ABED05B5F2C70317B@Desktop>
> Content-Type: text/plain; charset="us-ascii"
>
> Joe,
>
> I think you have two forms of O. obtusa. That species is blooming all over
> in these parts right now. Check the Wiki page on this species to see the
> number of color variants there are. You have a nice combination there.
>
> Andrew
> San Diego
>
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 13 Feb 2012 21:05:58 -0800
> From: Richard <richrd@nas.com>
> Subject: [pbs] Winter Projects
> To: Pacific Bulb Society <pbs@lists.ibiblio.org>
> Message-ID: <B479A048-FDAA-458B-9656-BEF5AA5FB7E3@nas.com>
> Content-Type: text/plain; charset=us-ascii
>
> Nursery scale stratification
>
> This is what we are working on now at our nursery, preparing mostly tree 
> and shrub seeds for a 90 day cold stratification and planting in May. 
> There are many ways to accomplish this task this is just my own twist on 
> the job. Earlier we used open top plastic bags but this gives us better 
> aeration and ease of inspection. Here is a series of pictures that 
> illustrates our process.
>
>
> rinsing presoaked seed  http://flic.kr/p/btpKEK/
> setting up tray, paper lined, peat bottom  http://flic.kr/p/btpJaP/
> fungicide dip (optional) http://flic.kr/p/btpLnK/
> spreading seed inside sandwiched layer http://flic.kr/p/btpNSF/
> placing seed inside sandwich http://flic.kr/p/btpM76/
> covering seed layer with peat http://flic.kr/p/btpJWH/
> stacking trays inside cooler. Note warm incubator on right 
> http://flic.kr/p/btpMMp/
> recording all data in a filemaker relational database 
> http://flic.kr/p/btpMYe/ In this screen shot from left is our field map, 
> propagation and seed inventory databases
>
> Working with Lily seed is new for me and I have a question in my following 
> post for lily savy stratifiers.
>
> Rich Haard
> Bellingham Washington
>
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 13 Feb 2012 21:08:02 -0800
> From: Richard <richrd@nas.com>
> Subject: [pbs] Lily Stratification
> To: Pacific Bulb Society <pbs@lists.ibiblio.org>
> Message-ID: <9FA5584B-B614-4A58-BE6C-6355780D3D7C@nas.com>
> Content-Type: text/plain; charset=us-ascii
>
> Question for lily stratifiers
>
> All three are fresh collections of L. columbianum and L. washingtonianum. 
> These are 'immediate cool hypogeal' species and were warm stratified 30 
> days at 50 deg f then the last 2 weeks at 40 deg F. All have begun putting 
> out a radical some reaching considerable length with signs of leaf shoot 
> on a few. They're growing now in mesh bags buried in moist peat. Otherwise 
> their condition is very nice, no mold.
>
> Earlier this fall in October I field planted the same collections and this 
> is a test to try stratification and tray planting. These radicals seem 
> rather fragile. Is it time to move them to flats and continue chilling for 
> another 60 days before placing outside?
>
> http://flic.kr/p/btoASZ/
> http://flic.kr/p/btoBoZ/
> http://flic.kr/p/btoBTR/
>
> http://pacificbulbsociety.org/pbswiki/index.php/…
>
> Rich Haard
> Bellingham, Washington
>
>
>
> ------------------------------
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