Buy Flowers › Silene regia - 4" Pot Silene regia - 4" Pot $7.50 Royal Catchfly, bright red flowers, clumping perennial, zone 5-8, 3-4' tall, midsummer blooms, US native Add To Cart Added! Royal Catchfly, bright red flowers, clumping perennial, zone 5-8, 3-4' tall, midsummer blooms, US native