RickCorey said: The park is currently (or was) really nice, green and pretty with lots of trees that have been there longer than the houses. Now some parts look like any other, grim, sterile lifeless "trailer park".
Hate it for you.... What about your yard?
Washington state should actually have fast growing trees..... Maybe plant some and then put a cage around them?
I tried transplanting some mulberries at my house to the property line where the stupid electric personel killed everything, and caged them to protect from herbivores.... But alas, too dry for success.
As far as compost goes... I toss weeds in pile, it's too dry here to worry about seeds.... Except for a couple of real trouble-makers.
When I bring plants in, they are always accompanied with enough seeds for years of a couple of born-pregnant evil invaders....
You might want to google mulberry weed and chamberbitter.....
From seed to flowers is like 2 weeks.... And a month after missing one of these dudes, thousands of progeny!
Those specific plants go into the barbeque.
But.... Chenopodium, amaranth, Sesbania, senna, and many others are actually encouraged.... I need all the help in soil building I can get.... And besides, I have songbirds like mad at my house.... Eating seed from my weed thicket.... I dug out the blackberry briars last winter and spread horse poop all over my front yard... The chenopodium promptly sprang up.... And now.... Seed covered brown stalks fulla birds! Yay!
But.... Any wet stuff from inside the house gets buried next to the weed pile(s).
Eventually I level the piles leaving the compost several inches thick.... Which actually helps to prevent weeds, they're all buried too deep to come up!