With all the difficult and slow-growing plants of the hard-wooded section, all the pruning must be done in this gradual way in the young wood as the plant progresses.
Faster-growing trees have a shorter life than slow-growing ones.
It is a slow-growing plant in most gardens, though it is freer in some warm soils, and a very long-lived plant where it likes the soil.
Division. P. comosum is very slow-growing, and must be particularly guarded against slugs.
R. palmatum is a slow-growing plant, and smaller than its variety, R. p. tanguticum, which increases rapidly, has fine foliage, and will be welcome to those who grow the other hardy species.