Alder (Alnus incana) [3 of 3]

Fertile female flowers develop in to small cones and they will often stay on the tree all winter, long after the seeds have dropped. The seeds themselves are distributed generally by floating on the water until they reach land.

These cones, which are quite unique for a deciduous tree, are quite often the defining feature in winter.

The Alder bears on its roots little nodules that contain a live bacterium which enable it to take soluble nitrogen salts out of the inert nitrogen of the air. Consequently, the spoil on which Alder grows is remarkably fertile.

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