Twenty of these letters derive their names from the trees prevalent in the Isles at the time, with an accompanying esoteric scheme that includes a calendar of thirteen moons and a means of manual communication similar to the mudri of the runes. The letters of the ogham are available in a Windows TrueType font . Uath Uath Huath h ath hawthorn Crataegus spp. It is cultivated in North America, often under the name of weeping birch. The three trees in my front yard form root sprouts that would take over the bed where they are planted if I didn't cut them back.
Birds are also responsible for dispersing the seeds.
Rowans thrive in poor soils and colonize disturbed areas. In some parts of Europe they are most common around ancient settlements, either because of their weedy nature or because they were planted. They are cultivated in North America, especially in the northeast. Like willows, alders sprout from stumps. This allows them to regenerate after heavy flooding.