Answer: Lilac Time Scotch Broom is a deciduous shrub with a fast growth rate. It tolerates drought and will grow in dry soil but prefers well-drained/loamy, sandy or clay soils with a pH of acidic to slightly alkaline. It needs full sun and should be pruned after flowering to keep the plant in nice shape. Fertilize in the spring with Holly-tone or Plant-tone as recommended on the label.
You can plant your brooms in containers but you'll need to either sink the pots into the ground for safe-keeping this winter, or protect the roots by wrapping insulating material around the pots. Obviously, above-ground roots are quite susceptible to winter damage, so insulating them will be necessary. I usually just sink the pots into the ground and then unearth them in the spring. My container plants get along just fine with this treatment. Best wishes with your new plants!
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