Answer: Rosmary 'Tuscan Blue' is a moderate growing shrub to 6' tall and 2'-4' wide, and 'Little Ollie' (Olea europae) is a moderate grower to 4'-6' high with equal width. Their rate of growth is similar, as is their size. You can keep them the same height with careful pruning, but at maturity, Little Ollie will look larger because of the width. Both require full sunshine and prefer soil on the dry side. Some perennials with the same cultural requirements include Achillea (yarrow), Agapanthus (Lily-of-the-Nile), Aloe, Artemisia, Centaurea, Coreopsis, bearded Iris, Oenothera (evening primrose), Romneya coulteri (Matillia poppy), Sedum (stonecrop), Salvia, Verbena and Zinnia. Hope this information helps you choose just the right companions for your new flower bed.
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