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Euphorbia palustris has proven to be an early spring winner in my wet clay environment. Most plants that like my conditions get off to a slow start and come into their own much later in the season, in July to August. But this water lover is a real early season gem. I think I should develop a list of golden plants for this early season. They really brighten the view of my perennial plantings, most of which are just emerging from the ground as a kind of rough stubble.
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The largest Euphorbias are about 30 inches tall. I have two planted with the variegated Calamagrostis 'Overdam', a combination that works well.
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This plant is in its second full year. Lots of sun seems to be to its liking. Two planted in the shade have hardly grown at all.