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  1. Planting Lena Scotch Broom (Cytisus x 'Lena') next to your lilac trees is probably not the best choice for several reasons. First, they both have different water needs; lilac needs regular moisture whereas Lena needs very little once established. The shade from the lilac trees will also cut back on the sun for Lena, which requires full sun. In fact planting Lena next to any large shrub or tree will constrain its low, broad profile. Lena is great as an edging plant along a driveway or lawn, as a single specimen or mixed in a bed or border with low-growing conifers, cotoneaster, or other drought-tolerant perennials or low-growing sub-shrubs. Additional waterwise plants include ceanothus, caryopteris, artemisia, rockrose (Cistus), lavender, germander, sage, lavender cotton (Santolina chamaecyparissus), and verbena--all which would be great companions for Lena.

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