Good gardening

Jane McGary janemcgary@earthlink.net
Thu, 29 Jun 2017 11:36:01 PDT
Mike asked,

"More experienced PBS members have told me that beds eventually start to 
decline and have to be dug out and renewed. I'd like to hold that off 
for as long as possible.Is there any maintenance or other work I should 
be doing to keep the beds viable? Any thoughts on how long I should 
expect a raised bed to thrive without intervention?"

I tried using direct planting in raised beds (under a roof) instead of 
plunged pots. For the first 3 years the bulbs did better, but then heavy 
rains caused groundwater to accumulate for too long under part of one 
bed and many bulbs rotted. I decided to change that area and eventually 
the entire bed (one of two) to a plunge for pots, having raised the 
level of the base about 6 inches. The other bed, which doesn't have a 
low spot so doesn't get too wet, has subsided as Mike describes, but the 
plants in it -- all xeric species -- are mostly doing well. I will have 
to lift some of them, mostly Narcissus cantabricus and N. romieuxii, 
because they have increased far too much (watch the BX!). I fertilize 
these plants in fall and spring with Miracle-Grow "root and bloom" 
formula and one year I topdressed both beds with a little composted cow 
manure, having observed in nature that many bulbs grow especially well 
in pastures. I also have an open raised bed built 2 years ago especially 
for species tulips, and it also has some Oncocyclus hybrid irises that 
have survived, though looking rather ragged in winter; the fill for this 
bed includes a high percentage of coarse ground pumice and some 
composted manure as well as coarse sand, and I threw some limestone 
chips on top.

So my opinion is that most of the species we like to grow do best if 
given a free root run, but you have to be careful about what is 
happening at the lower level of the bed. Also, if you live where there 
are weeds in the vicinity, they will grow furiously once their seeds 
blow into the raised beds. It's also important not to put very small 
things into the bed, because the larger plants will overwhelm them. Now 
I'm growing all my young bulbs in pots (I grow almost all my bulbs from 
seed) for the first few years, and tiny species stay in the pots.

Jane McGary
Portland, Oregon, USA
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