Storage upon arrival:
Use a low humidity, well-ventilated area. Short-term storage temperature should be 55-60⁰F. Long-term storage or if the sprouts begin to show, lower the temperature to 41⁰ F
Use sterilized, well-draining planting medium with a pH 6.00 to 6.80. Never use fresh manure or tree bark as part of the medium. Ideally the soil mix should consist of 1/3 peat, 1/3 sand, 1/3 compost or 1/2 peat and 1/2 sand or 60% coarse peat + 40% perlite. Branded potting soils such as Sunshine #4 may also be used. Use clean pots which will accommodate the bulb(s) comfortably without much room to spare. Pots must have drainage holes. Do not damage or remove existing roots. Hold the bulb so that the roots hang down into the pot. Firm in the medium around the bulb so that no air pockets remain amongst the roots. The bulb nose should be above the rim of the pot, and the shoulders of the bulb just above the surface of the soil. Pots may be placed next to each other. Do not use saucers. Ensure that the area is well ventilated and that the relative humidity stay as low as possible.
After planting, water thoroughly. Subsequently, the medium should be kept only slightly moist. It is important not to overwater the plant in order to stimulate regrowth of the basal root system. USE TEPID WATER!! Do not water the bulb nose.
Maintain a CONSTANT temperature day and night of 79° F to 82° F for optimal results - bottom heating is preferred. During the forcing period the temperature should never fall below 72° F or rise above 86° F. To delay the flowering, place pots at 48° F at stage 2 (before opening of the first bud). At this temperature growth will virtually come to a halt and the plants may be kept at this temperature for up to 10 days. To make the plants resume growth, move the pots to a warmer area. No water should be administered while the plants are 9° C (48° F). To ACCELERATE growth, increase the temperature in the greenhouse, always ensuring an even, constant temperature day and night. Do not exceed 86° F.
Hippeastrums may be forced in full light as well as in darkness (until stage 2) as long as the above guidelines as to temperature, ventilation and humidity are followed. If the bulbs have been forced in the dark until stage 2, the plants will need source is oblique from one side. Low light conditions and lower temperatures during forcing will result in taller stems at flowering. High light conditions and higher temperatures during forcing will promote shorter stems at flowering