The most popular varieties in cultivation are the domestic and Japanese plum varieties. They have fruits that vary in shape – oblong or globular and in colour – from pink to purple. Up to 2,000 varieties are now grown worldwide, although the importance in orcharding is around 100. The house plum is a tree with a short trunk and a branching crown, and it flowers in spring – usually before the leaves appear. The plum tree tolerates drought badly, but at the same time does not tolerate excess water, which can cause the fruit to rot. Interestingly, plum trees have many times the root reach than the crown circumference.