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Buddleia davidii Black Knight This moderate growing shrub grows 6 to 9 feet tall, 4 to 6 feet round. Fragrant dark blue summer flowers attract butterflies. Grow in full sun or light shade with moderate water. Best used as a background plant as the butterfly larvae will nibble the leaves. Donšt spray! Youšll soon have more butterflies. Plants A-B | C-D | E-H | I-L | M-R | S-Z |