Castanea species

• Chestnut Hybrids

Seed - where possible sow the seed as soon as it is ripe in a cold frame or in a seed bed outdoors^[2]. The seed must be protected from mice and squirrels. The seed has a short viability and must not be allowed to become dry. It can be stored in a cool place, such as the salad compartment of a fridge, for a few months if it is kept moist, but check regularly for signs of germination. The seed should germinate in late winter or early spring. If sown in an outdoor seedbed, the plants can be left in situ for 1 - 2 years before planting them out in their permanent positions. If grown in pots, the plants can be put out into their permanent positions in the summer or autumn, making sure to give them some protection from the cold in their first winter[K]. These plants are of hybrid origin, so seed is unlikely to breed true[K].

This record includes a number of garden hybrids involving various species - the origin of each hybrid will be mentioned in the individual cultivar notes. To date, these different hybrids have not been assigned their own specific name. The following notes are based on the general needs of the genus.

Prefers a good well-drained slightly acid loam but succeeds in dry soils^[3][4][5]. Once established, it is very drought tolerant^[3][4][5]. Very tolerant of highly acid, infertile dry sands^[5]. Averse to calcareous soils but succeeds on harder limestones^[4][5]. An excellent soil-enriching understorey in pine forests^[5]. Flowers are produced on wood of the current year's growth^[6]. Plants are fairly self-sterile^[5]. They hybridize freely with other members of this genus^[5].

Plants in this genus are notably resistant to honey fungus^[5].