Agastache Blue Boa - Easy to grow plants producing huge, eye-catching flower spikes! A great focal point to a perennial border and great for attracting bees. Bred for its massive flowers, with tall, showy upright, violet blue spikes, repeat blooming over a long period. Flowers mid July-Spetember Ht. (20-24"), Spread 30-40cm (12-16"). Delivery May onwards unless otherwise stated.