The largest group when it comes to commercial propagation in Holland at the moment, hundreds of hectares are planted each year. This type of lilies is incredible popular at flower growers on the entire globe. Rightfully so, they are the most colourful and most graceful lilies of all. Unlike most other lilies they prefer to grow in slightly acid soil. When the soil is not exactly to their liking it is not like they do not grow at all, the first year you might not even notice it. The bulb has enough reserve energy stored in the scales to perform well in the first year. But in the nest years you will start to see that the plants are growing smaller and eventually even disappear completely. When the acidity in the soil is not good the plant is not able to absorb enough nutrition to grow well. Once you know your soil is not acid enough for Oriëntal lilies you can solve the problem by adding a good part of peat in the planting hole and you will see the lilies perform much better. Please do make sure to use peat and no potting soil. Potting soil is rather neutral and does not raise the acidity.