evergreens for wet soil?


I am helping with my son's new garden, the complete opposite of my 
soil conditions.  I live on top of a hill that also has a gravel pit 
on it.  He is at sea level, and when the tide is high, the 
neighbourhood floods.  I don't think it is seawater, just that the 
storm drains probably empty into the sea and the water has nowhere to 
go during a very high tide.  Yesterday, when the tides were normal, I 
found water at a trowel's depth.  I am amazed that there are a couple 
of old apple trees that seem to be thriving.  The previous owner and 
the neighbour on one side made some raised beds, but it was in one of 
these that I discovered the water when I dug out an unhappy trillium. 
The entire back yard and part of the front is also full of horsetail 
(Equisetum), so I don't want to plant anything permanent until I get 
control of that.  (Amazing how nice the yard looked when he bought it 
midwinter.  I was looking forward to interesting old dormant plants 
emerging in the spring, so the horsetail was an unhappy surprise.)

A couple of questions:

I have checked on waterside plants, and they all seem to lose their 
leaves in the winter.  Does anyone know of any that don't?

Does anyone have a suggestion for a fast annual that would like heavy 
wet soil, to help shade out the horsetail?

The area is mild in winter, but not very warm in summer - tomatoes 
need all the help they can get to ripen before winter.

Diane Whitehead   Victoria, British Columbia, Canada
maritime zone 8,  Sunset zone 4
cool mediterranean climate



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