As flamboyant as their tropical American ancestry (WHAT ), Cannas are among the most colorful summer bulbs with ruffled spikes tapering to refined buds, boasting immense, paddle shaped leaves. Their great reedy canes and palmy foliage make for large, magnificent plants, yielding blooms all summer long for long lasting curb appeal. They are deer resistant and appear most dramatic when grouped in masses. These are fast growers with large flowers. Black Knight grows strong, tall stems with maroon like colored leaves and scarlet red blooms. If planted 12" apart 144 roots will cover 133 sq. ft. , whereas if planted 18" apart 144 roots will cover 324 sq. ft. Plant for the look you want, or the needs you are trying to achieve.