seedlings emerging

M Gastil-Buhl gastil.buhl@gmail.com
Thu, 09 Jan 2020 12:13:53 PST
Hi Uli,

I look forward to your Bulb Garden article. Here is a photo of my mini
plunge bed trays for seed pots. I totally agree bigger pots provide not
just more moisture reservoir but also dampen the temperature highs and
lows. I am not sure my mini plunge is worth the extra effort, as I have not
tracked results precisely. My impression has been that seedlings do better.
But this is strongly biased because I only give them this advantage after
they earn it by emerging (germinating). The tiny pots are 2.25 square at
top and 3 inches tall. Each tray holds 15 tiny pots. Each spot is held open
by a lower pot, with coarse sand at the bottom. The trays have holes
drilled in their bottom and window screen between two nested trays holds
the coarse sand in. The sand stays damp a long time. Some species like to
send roots into the sand.

Yes November is late to sow the winter growers. But this does avoid the
heat waves we get in September and October. Next year I plan to sow in
September and have better protection from excessive heat. I am building a
screen house. This may also allow this year's seedlings to postpone summer
dormancy.

A second, not so pretty, photo shows a mini plunge late last May where all
but the Veltheimia seedlings have already gone dormant. A disadvantage of
mixing species in the same tray is they all get the same conditions. I grow
in tiny quantities so I never fill a whole tray with one species or even
one genus.

A third photo shows a mini plunge tray with 2 to 3 year old seedlings. A
Lachenalia viridiflora had its first bloom.
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