Hort625Hydrangealec Hydrangea Hydrangea macrophylla subsp. Plants of certain cultivars will have blue flowers if grown in acid soil and pink flowers if grown in alkaline soil. Inconspicuous fertile flowers are buried below sepals. With butterfly cuttings, two shoots per cutting are achieved early in production.
Intermittent mist prevents wilting.
At the end of the summer, plants are defoliated with chemical sprays of butyne diol, ethrel, or florel. After removing from mist, provide shade so that light intensity is less than 4,000 f.c. Syringe plants in the afternoon for 4-7 days to reduce shock. Plants may remain in the pot for over 22 wks, so using a good root medium is important. Vegetative growth normally occurs during the summer in the greenhouse or outdoors under shade.