Timing:
Crop time depends on the variety, number of cuttings per container, pot size and pinching. Based on varieties of Medium earliness, with four rooted cuttings in a 10" hanging basket and 1 pinch, a March 1 planting date is appropriate for Mother's Day sales in most parts of the country.
pH/Fertilizer:
Maintain pH at about 5.5-5.8, about .5 below the level used for zonals. Fertilizer levels can range from 200-250 ppm N using constant feed applications.
Growth Regulators:
Compact varieties do not need growth regulators. Medium ones could benefit from one to two applications of Cycocel®, while trailing types might need two applications of Cycocel®. Once actively growing, all varieties benefit from a Florel® application at 500 ppm. Soft pinching at the same time helps create a full plant.
Stress:
High salt (EC) levels can cause more problems for ivies than for zonals. Too little or too much moisture can cause root loss and decrease crop quality. Water only when needed and aim for leaching 10 -15% of the applied water to maintain ideal EC levels of no higher than 1.5 (2:1 extract). Be careful to not over water hanging baskets.
Temperature:
Bottom heat is critical, especially during the first week after receipt of the plants. Maintain air temperature at 65ºF night and do not vent until 76ºF day temperature is reached.
Oedema Control:
There are a number of steps that can be taken to prevent or reduce oedema. After cuttings are established, the day temperature should be reduced to about 75ºF and the relative humidity kept between 60 and 70%. Reduced light levels early on in the crop could result in oedema problems. Irrigation should be done early in the day. Manage irrigation so as to avoid over-watering. The pH should be adjusted to 5.5 and fertilization should be reviewed to be sure the plants are on a regular schedule. Additional iron, magnesium, and phosphorous are also beneficial.
Light:
High light levels of 3,500-4,500 f.c. are required throughout much of the growing cycle. Plants indicate a need for less light by a reddening of their petioles and stems. Mature plants in the landscape are well adapted to full sun.