Some triploid varieties grown in Europe are seedless. Resin content is controlled by many pairs of genes. Disease resistance is found in some tetraploids. Most countries both export and import hops for a variety of beer flavors. Naturalized in many areas.
Hops are quite hardy if other growing conditions are good.
Annual rainfall requirement is about 30 cm, distributed between March and August. Dry weather in September is best for the harvest. Hops do well over a wide range of soils provided they are fertile and moisture-holding. Light to heavy loams are best. Soil depth of 45 dm is required for the Goldings varieties.