Description : my delphinium die every year before the frost
Last Answer : They come back in zone 3, 4 , 5, 6 & &7. like sunny to part sun location loamy soil, like cool moist summer, don't let the soil dry out. feed liquid fertilizer every 2 to 3 weeks, deadhead flowers.........take of shoots & leave 2 or 3 flowers per plant...need to be staked. ph should be 6.0-7.5