Our cottonwood seedlings have already germinated around the gardens and it's a depressing sight to see the "haze" of millions (I am not kidding) little seedlings that will have to be addressed in short order. I spray many with RoundUp and we get them early with hand hoes but they have literally invaded every inch of exposed soil, cracks between bricks and along gravel paths. This is an annual event and we'll get thru it as time allows. Lots of planting on the horizon; tomorrow in fact!
In our climate, I feel the perennial with the longest "bloom window" is the yellow fumitory (Corydalis lutea). In the image to the left, you see many specimens throughout our shade garden. It is only 12" tall with delicate, light blue/green foliage (reminiscent of bleeding heart) topped with yellow blooms from late April until hard frost in October or even November. This plant prefers part shade and tolerates a wide range of soils. It does self-sow readily so you will see colonies forming as the babies emerge. It is easy to "thin the herd" as we do every year. I'm always impressed with this plant and I can take the same picture in the same location in late September and it will look the same in terms of flower power. Highly recommended. Below is a neat shrub called dappled willow (Salix integra 'Hakuro Nishiki') that has whitish, speckled new growth with hints of pink and salmon. Left alone, this shrub can get 8-12' tall. However, we cut it back to 6" every winter and watch the explosion of fresh new growth that will shoot up to 3-4' during the season. We do this "severe cutback" every year to encourage the most colorful growth and to also maintain a more compact size.
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