Answer: If you planted Russian lavender, you've planted them way too close! Perovskia atriplicifolia 'Longin' is Russian Sage (zones 4-9). It looks similar to Lavender with it's stiff, upright stems. Intense, deep blue flowers on a compact perennial. Foliage smells like sage when crushed. This plant will grow huge! Average height: 36-48" with a spread of: 36-48". If this is the plant you've installed, you won't need to plant anything else in the bed.
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