sonii_),
fraxinella, _Anthemis tinctoria_, single _Campanula persicifolia_,
_Campanula rapunculoides_, _Campanula glomerata_, globe flower
(trollius), snapdragon (antirrhinum), platycodon, lavender (where it is
proven hardy), and musk mallow (_Malva moschata_).

Of the lilies, _Lilium Philadelphicum_, _L. elegans_, _L. speciosum_,
and _L. longiflorum_ are all desirable, and they thrive in partial
shade, though in Japan _L. elegans_ will be found standing out from the
rocks in full sunshine. For peering over into the rock garden, rather
than being placed in it, _L. Canadense_, _L. tigrinum_, and _L.
superbum_ are recommended.

[Illustration: A rock garden merging into woodland. A curved path is
desirable, as it affords a greater number of vistas]

The pick of the low shrubs are the charming _Daphne cneorum_, which
flourishes better for being lifted above the ordinary garden level, and
_Azalea am[oe]na_. The latter, however, should be so placed that its
trying solferino does not make a bad color clash. Rhododendrons and
mountain laurel fringe a rock garden well, and with one trailing
juniper (_Juniperus procumbens_) will provide a great deal of the
refreshing winter green.

Single roses, the species, fit in well where there is room for them.
Good ones are _R. setigera_, _R. rubiginosa_, _R. Wichuraiana_, all
rampant, and the low _R. blanda_. The roses would better be at or near
the entrance or exit, or far enough above the rock work not to ramble
over small plants.

The plants in this list cover all seasons and vary somewhat in their
soil and moisture requirements. But the variation is nothing beyond the
ordinary garden knowledge. Most will do better if their preferences are
considered, but none is apt to perish with average care.

Alpines, as a class, would better be left to the amateur with the time,
money, and disposition to specialize. Most of them take kindly to being
transferred from a mile or more up in the air to sea level; the
edelweiss, for one, grows here readily from seed, and the exquisitely
beautiful _Gentiana acaulis_ thrives in American rock gardens. But, on
the whole, alpines do not do as well here as in England, where the
summer climate is not so hard on them. When they flourish here, it is at
the cost of a great amount of professional care.

THE WALL GARDEN

A wall garden is a perpendicular rock garden. But whereas a rock garden
is of all things irregular, a wall garden has regularity.