Of its well-known beauties, as regards its form, colour, varieties, and delicious perfume, description is needless, though I may say, in passing, that its fragrance renders it of value to those whose olfactory nerve is dead to the scent of most other flowers.
Two errors are frequently committed in planting the Wallflower; first, at the wrong time, when it is nearly a full-grown specimen and showing its flowers; next, in the wrong way, as in rows or dotted about. It should be transplanted from the seed beds when small, in summer or early autumn, and not in ones and twos, but in bold and irregular groups of scores together; anything like lines or designs seems out of harmony with this semi-wildling. There is another and very easy method which I should like to mention, as a suggestion—that of naturalisation; let those near ruins, quarries, and railway embankments and cuttings, generously scatter some seed thereon during the spring showers, when the air is still; in such dry situations this flower proves more hardy than in many gardens. Moreover, they serve to show it to advantage, either alone or in connection with other shrubs, as the whin, which flowers at the same time; here, too, it would be comparatively safe from being "grubbed up."
Flowering period, January to June.
Cheiranthus Marshallii.
Marshall's Wallflower; Nat. Ord. Cruciferæ.
A distinct and very hardy hybrid, being shrubby and tree-like in shape, but withal very dwarf. From the compact habit, abundance and long duration of its flowers, it is well suited for showy borders or lines. It is not yet well known, but its qualities are such that there can be no wonder at its quickly coming to the front where known.
It differs from the common Wallflower in being more dwarf and horizontally branched, while the leaves are more bent back, hairy, and toothed; immediately below the floriferous part of the stem the leaves are more crowded, the stems more angular, the flowers much less, not so straggling, and of a dark orange colour. Other hybrids in the same way are being produced, differing mostly in the colour of the flowers, as lemon, greenish-yellow, copper, and so on.
Plants a year old are so easily raised from cuttings, and form such neat specimens, that a stock cannot be otherwise than very useful in any garden; besides, they lift so well that transplanting may be done at any time. My finest specimens have been grown from their cutting state, on a bed of sifted ashes liberally mixed with well-rotted stable manure; in such light material they have not only done well, but, when a few roots were required, they lifted large balls without leaving any fibre in the ground. To have good stout stock before winter sets in, slips should be taken from the old plants as soon as they have done flowering; dibble them into light but well enriched soil, and give water in droughty weather only.
I ought to mention that this dwarf Wallflower, and also its allied kinds, are capital subjects for very dry situations; on old walls and the tops of outhouses they not only do well, but prove decorative throughout the year. In such places plants will live to a great age, and sow their own seed freely besides.