Cultivation guide for calla lilies | Greenhouse climate and lighting:Calla lilies thrive when they get enough light, which they need to produce flowers. The successful cultivation of calla lilies depends on a sufficient amount of light, in combination with the right greenhouse temperature, nutrient program and irrigation. It is therefore necessary to continually monitor and adjust the temperature in the greenhouse and ensure the best possible humidity conditions. This will result in proper plant growth and promote the evaporation of excess moisture. The best humidity conditions for calla lilies are 65 - 75%. Prevent a relative humidity below 50% and avoid considerable fluctuations in relative humidity during the daytime. Calla lilies thrive best when cultivation variables are kept constant. The right light intensity will produce not only more flowers, but also flowers of a better color. Enough light prevents excessive stem growth and drooping plants and leaves. Higher temperatures will shorten the cultivation process, but if the light intensity is too low this will lead to a lower profusion of flowers, a decrease in plant vigor and weaker stems. Screening is recommended at a light intensity of 450 Watt/m2 or above (375 Watt/yd2 or 5,000 foot-candles of 55,000 Lux). Screens in combination with a horizontal air circulation system will help to create a stable cultivation climate. Screening can keep greenhouse temperatures down, while preventing the relative humidity from dropping. Irrigation:Calla lilies can be watered through overhead irrigation, but watch out for dry spots. After planting, the tubers must receive enough water to promote root development. In warmer climates we highly recommend using a drip system to ensure constant watering. However, we advise overhead irrigation until the first leaves unfurl. It is better not to give them too much water until they have reached this stage. The soil should not be too wet, rather a little on the dry side. Once the first flowers being to appear irrigation can be increased and the soil may be moister. Not enough water in that phase will produce fewer and smaller flowers. However, too much water is dangerous as you Nutrients and fertilizers:The first step in setting up a nutrient and fertilizer program is to take a soil sample. If pH values are too low calcium should be mixed into the soil before planting. Potassium, magnesium and iron are also important nutrients and must be mixed into the soil in the right amounts prior to the planting process. It is also important to achieve the right balance between nitrogen and potassium. Too much nitrogen will result in longer stems and drooping plants. A good quality of water is important, treated with a fertilizer to an EC (electrical conductivity) of approximately 1.5. Callas are highly sensitive to higher Sodium (Na), Sulphate (SO4), Bicarbonate (HC03) and Chloride (Cl) contents. The EC in the soil should never be higher than 2.0. Crop protection:Erwinia Carotovora, Pythium and Rhizoctonia - most commonly caused by a cultivation problem - are the most common diseases to affect calla lilies. Well-draining soil and a good disease prevention program are important factors in preventing premature plant death. In order to grow healthy plants under good cultivation conditions it Insects:It is important to keep your plants free from insects to ensure a consistently high quality. Check regularly for aphids, trips and whiteflies. If you would like more information about this, don’t hesitate to contact us. DisclaimerAlthough the content of this cultivation guide has been compiled with the greatest possible care, it is only a means of providing general, obligation-free advice and cannot serve as a guarantee for healthy plants. The influence of cultivation conditions on the growth of plants, and additionally the effect of specific agents and methods can vary depending on the climate. Zabo Plant does not accept any liability whatsoever for any damage arising from the use of the information in this cultivation guide. |
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