Answer: "Hollandia" is a type of Warminster broom (Cytisus x praecox) and should grow about 4 feet tall. It prefers full sun, excellent drainage as would be obtained with a somewhat sandy soil, and blooms profusely in early spring. While many gardeners do cut back other types of broom such as Scotch Broom regularly, it is not critical for this one. If you trim it back for tidiness, do so lightly immediately after flowering. Yo may also trim away any winterkill in early spring.
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