Pondside planting

Jane McGary via pbs pbs@lists.pacificbulbsociety.net
Thu, 26 Nov 2020 13:00:25 PST
Uli's mentioning Narcissus is a good point. I've never succeeded 
perfectly with N. poeticus here, but N. obvallaris and the Cyclamineus 
hybrid 'Jenny' both naturalized beautifully in a seasonally wet area in 
my old garden, and the former is a mainstay of my present bulb lawn, 
which is well drained but seasonally wet. I've seen N. cyclamineus 
itself growing well in a garden on the Oregon coast, but it does not 
thrive for me. Another that does very well here  in damp places is 
Narcissus jonquilla, a population grown originally from wild-collected 
seed. And of all things, I saw Narcissus tazetta growing in a seaside 
marsh by the Mediterranean.

And the point about Fritillaria meleagris is very important! Many people 
don't know it's a denizen of wet meadows. It has self-sown by the 
hundreds here, both in the bioswale and in a well-irrigated rich border 
setting. Best to buy it in a pot, because stored bulbs deteriorate 
badly. Fritillaria camtschatcensis is also a plant of moist places, but 
it should have a dry, i.e. frozen, winter dormancy. My Leucojum vernum 
is planted where the overflow from the sump pump runs down on rainy days.

The trees one would expect to find near a pond in our region are mostly 
pretty invasive or have huge floppy leaves. I'd stick with a conifer if 
you want a little shade.

Uli wrote, "There are many other bulbs which I cannot cite from memory, 
but reading their descriptions it often says something like: grows in 
seasonally wet depressions or the South African vlei which is a shallow 
seasonal pool. Don’t Californian tuberous Delphinium grow like this?" We 
call these "vernal pools," and they are a treasured part of the Pacific 
Coast, though mostly gone now because of development. I don't think 
Delphinium nudicaule and its relatives grow in them; the flowers are 
mainly annuals. You do see the tuberous Delphinium leucophaeum in 
seasonal ditches, but it likes a dry summer dormancy and has colonized 
my bulb house. Some vernal-pool plants even flower under the surface of 
very shallow water, but most flower in succession as the water rapidly 
evaporates in "circles." Some of these spring annuals can be grown in 
the colder climate of the Pacific Northwest, but don't ever plant a 
"wildflower mixture," or you will end up with California poppies forever 
and not much else.

Jane McGary, Portland, Oregon, USA

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