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Commercial Growing Instructions
Hadeco® Amaryllis are easy to produce in a short period of time. To ensure the most efficient and consistent growth in your greenhouse follow these simple tips:
1. Pre-Forcing Storage
Hadeco® Hippeastrums may be stored until end January under ideal conditions:
Temperature: 9°C (48°F) is ideal
Never lower than 5°C (41 °F)
Temperatures higher than 12°C (54°F) will progressively initiate sprouting
Humidity: 65% to 70% ideally
Too low and the roots will dry out; too high and mould will form on the roots (not harmful, and can be removed by brushing)
Humidity can be increased simply by pouring water on the floor in the room used for storage
Check roots weekly to ensure they are not becoming brittle (humidity too low)
Ventilation: some fresh air as well as internal circulation is required
A vent should be open in the storage room, and a strong fan should be used to keep the internal air moving
Storage crates should have sufficient ventilation holes
2. Medium:
The best medium is one that is relatively dense but well- draining:
Ideally the soil mixture should consist of 2/3 potting soil and 1/3 sand
Peat should be used sparingly, and should never form the main component of the mixture. Up to 30% is acceptable when used to lighten the mixture
A pH of 6.00 to 6.80 is best
Sterilised medium is suggested
Never use fresh manure, fresh compost or tree bark (tree bark may be used in the decoration above the medium)
3. Planting:
Use clean pots approximately 15cm (6”) tall and 15cm (6”) diameter at top for Symphony size 26/up. 24/26 is best planted in 12.5cm pots. Sonata’s and Sonatini’s look best planted in 10 cm pots
Pots must have drainage holes• Do not remove or damage 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 shoulder of the bulb just above the surface of the medium
Pots may be placed against each other on the bench. This gives a density of ±42 pots per square metre (±36 pots per sq. yd). Do not use saucers as this impedes drainage
4. Location for growing:
Hadeco® Hippeastrums may be forced in any well ventilated and well heated area
Maintain a constant temperature day and night of 26°C to 28°C (79°F to 82°F) for optimal resultsCommercial Growing Instructions - continued (page6)
Bottom heating is preferred
During the forcing period the temperatures should never fall below 22°C (72°F) or rise above 30°C (86°F). Low temperatures will slow growth, and high temperatures could cause stress in the plant
Ensure that the area is well ventilated and that the relative humidity of the air remains as low as possible
A greenhouse in which the above requirements can be maintained is ideal but Hadeco® Hippeastrums may be forced in full light as well as in darkness until the stem is 10cm in length provided the above guidelines as to temperature, ventilation and humidity are followed. If the bulbs have been forced in the dark until marketing stage, the plants will need from 4 to 7 days in medium light intensity to form chlorophyll. Rotate pots through 180° (a half turn) every few days if the light source is oblique from one side.
The following conditions will encourage shorter stems:
High light conditions,
Higher temperatures and
Reduced watering
Conversely, low light conditions, lower temperatures and increased watering during forcing will promote longer stems at flowering.
5. Timing:
During forcing, if growth is too rapid, you may slow the progress of the stems by reducing temperature. This can be done at any time prior to the buds opening, and is best done earlier in the development (when stems are 20cm high). At 9°C (48°F) growth will virtually come to a halt and the plants may be kept at this temperature for up to 10 days. A longer period at low temperature will start to impact on the ability of the bud to open. Watering is not required during this “holding” period. Light can be withheld in this time if desired
To make the plants resume growth, move the pots to a warmer area
To accelerate growth, increase the temperature in the greenhouse, always ensuring an even, constant temperature day and night. Do not exceed 30°C (86°F)
6. Watering:
After planting, water thoroughly and firm down the medium well
The second watering application should be delayed by about 7 days to encourage new root formation. A slightly cooler temperature of 20 °C during this period will additionally promote new root development
Subsequently, the medium should be kept only slightly moist. By tipping the pot upside down, and sliding the medium out from the pot as a unit you can check the moisture level at the bottom of the pot. Once the medium has dried out to 3cm from the base, it is time to water again (usually every 4 to 5 days)
It is important not to over-water as this can cause deterioration of the roots
Use tepid water of approximately the same temperature as the greenhouse air temperature
Do not water over the bulb noses
7. Further Care:
You may refer consumers to www.hadecoamaryllis.com for tips on caring for Amaryllis in the home.
For further enquiries, please email info@hadecobulbs.com
