Delphiniums Black Knight
Dark violet Sanity petals with tall spikey stems perfect for borders and cut flowers Remove faded spikes at the base this will encourage repeat blooming in fall. In hot, humid summer Plants are often attacked by mildew in mid summer; cut back hard to encourage fresh foliage. Use a high phosphorous fertilizer each year, in early spring. Will require staking early in the season.
Sandy or clay. Full sun