P. Useful border plants which are best planted in March (they may be divided at the same time). Pyrethrums grow to about 2 ½ ft., preferring light rather than heavy land. They are grown in huge quantities for cut, but must be cut before the blooms are fully developed. They flower in May and June, a second flush of bloom often appearing in late summer if the plants are cut back after flowering. After about 3 years pyrcthrums tend to deteriorate and should be divided. The doubles are usually less vigorous than the singles. Slugs are very fond of pyrethrums and should be controlled by a metaldehyde preparation.
Avalanche: white. Single.
Brenda: warm cerise, firm. Excellent for . Single.
Bressingham Red: carmine-crimson. Extra large. Single.
Eileen May Robinson: light pink. Single.
Evenglow: salmon-red. Excellent for cutting and a superb colour under artificial light. Single.
Kelwafs Glorious: crimson-scarlet. Another useful cut flower variety.
Lord Rosebery: velvety crimson. Double.
Madeleine: peach-pink. Double.
Salmon Beauty: rather small salmon-pink flowers. A good colour but constitution somewhat weak. Single.
Scarlet Glow: scarlet. Useful for cutting. Single.
Yvonne Cayeaux: ivory-cream. Double.
PYROLA ROTUNDIFOLIA A most attractive plant for a cool, shadyon the rockery or among shrubs like . It belongs to the heather family (Ericaceae) and has glossy, evergreen foliage. The fragrant, white flowers, somewhat like lily-of-the-valley, appear in May and June and are useful for cutting. The plant grows to about 1 ft. and pot-grown specimens seem to move best. Leaf mould and peat should be well mixed with the soil (which should be lime-free) to give a soft, spongy texture. Water freely as necessary in hot summers. Increase by division in early spring.