Ariel Dogliotti is a reliable and high-quality gardening helper who charges reasonable fees and does great work -- especially on the kinds of gardens that Seattle grows, i.e. big multi-plant gardens with lots of growth.
He also does painting, other general projects as well as his landscaping business. For instance, we had him paint a small house addition and he did a fantastic job for a very reasonable hourly fee.
He speaks fluent spanish and is conversant with a slower pace in english. Give him a call - with your input on the kinds of plants you'd like, or, even better, your advanced purchase of the plants you want put in, he will do a great job turning your garden into a landscaped wonder. And I'm sure he'd go on a reasonable "retainer" to keep it in good shape year round.