Dahlia.—Make the ground on which this flower is to be planted thoroughly rich. It is a rapid grower, and cannot attain to fine proportions on a poor soil. If the plants are carefully prepared for the change by free exposure on genial days, and also during warm nights, they will scarcely feel the removal. When first put out, dress the surrounding soil with soot to prevent injury by slugs, which show a decided partiality for newly planted Dahlias. Give water freely when requisite, and in staking the plants take care that the ties do not cut the branches. These ties will require attention occasionally during the summer and autumn.
Delphinium.—Sow the perennial varieties on a prepared bed. Thin early, without removing all the weaker seedlings, and when sufficiently advanced to bear removal, transfer to borders where the plants are to flower.
Hollyhocks may be put into the borders when the weather is quite warm. Wait until the end of the month, or even the beginning of June, rather than have them nipped by an untimely frost. Like the Dahlia this plant must have unstinted supplies of water and abundance of manure. A tall stake, firmly fixed, will also be necessary for each plant.
Nicotiana.—Seed may be sown on an open, sunny border, but it is a waste of seed and labour to put it into poor soil. Prepare the ground beforehand by deep digging, and by incorporating plenty of manure. If the near presence of other plants renders this impossible, drive a bar into the soil and work a good-sized hole. Fill it with rich stuff to within a few inches of the surface, and finish with fine soil, on which sow the seed. This method can only be adopted for light land. In the event of a cutting east wind after the seedlings are up, improvise some kind of shelter until the danger is past.
Petunias are very sensitive under a frost or cold wind. Therefore be in no hurry to bed the plants until quite the end of the month or beginning of June, especially if the weather appears to be at all threatening. A good mellow soil, free of recent manure, suits them. If unduly rich, it will strengthen the foliage at the expense of the flowers, and will also postpone the blooming until late in the season.
Portulaca.—It is useless to sow until the temperature is summerlike. If necessary, wait until the close of the month, or longer, before putting in the seed. This flower will endure neither a moist atmosphere nor a retentive soil. Sow on raised beds of light soil, the more sandy the better; and in seasons which speedily burn the life out of other plants, Portulacas will display their beauty, no matter how fiercely the sun may beat upon them. Water will occasionally be necessary, but it should never be given until there is obvious need for it. Portulacas are easily grown in pots or window-boxes, and they will bloom profusely where many other flowers only wither and die.
Primula.—Almost every season witnesses the advent of some novelty in this flower, either in colour or in form. And the plant is now worth growing for the beauty and diversity of its foliage alone. The flowers range from pure white through all shades of tender rose up to a deep, rich crimson. After years of earnest effort, two beautiful blue flowers have been obtained. There are also several elegant double strains, and these possess a special value for bouquets, because of their enduring quality. All the varieties, including the popular Star Primulas, can be grown with ease in any soil which is fairly rich and friable. Equal parts of leaf-mould and loam, with a little sand, will suit them to perfection. Fill the pots firmly, taking precautions to insure effective drainage. A thin layer of silver sand sifted over the soil will aid an even sowing by showing up the seed. As a finish, shake over just enough fine soil to hide the sand. Thin sowing is important, because the most reliable new seed is almost certain to germinate at intervals, and the plants which come first can then be lifted without imperilling the remainder. Prick off as fast as ready round the edges of small pots, and shade until established. Then give air more and more freely.
Stock, Ten-week.—The preparation of the soil is the first business, and whether the Stocks are intended to be grown in small groups or alone in beds, the treatment should be the same in either case. With light land there is no difficulty; it is only needful to dig it well, and to incorporate a sufficient quantity of decayed manure. If disposed to incur a little extra trouble to give the plants a start, take out some soil with a trowel, and fill the hole with compost from the potting shed. This course is indispensable on heavy land; and assuming it to be rich enough, the quickest and most effectual way is to make drills six inches deep at the proper distances, and nearly fill them with prepared soil, in which the Stocks can be planted. For a short time afterwards provide shelter from the midday sun, but do not keep them covered a moment longer than is necessary. In planting it must not be forgotten that an uncertain proportion of single specimens will have to come out. On this account it is advisable to put them in small groups, and remove the surplus even if they are double,
Sweet William.—The introduction of several new varieties has created a fresh interest in this fine old garden favourite. This is one of the hardy biennials that will not be hustled. On a nicely prepared bed in the open sow thinly in drills either during this month or up to July. In due time transplant in rows, affording sufficient space for each specimen to become stocky, and in autumn transfer to flowering quarters.
Verbena.—Beds for Verbenas should be rich, mellow, and very sweet. A poor soil not only produces poor flowers, but it materially shortens the blooming period. Peg the plants down from the outset, and allow them to cross and recross each other until there is a sheet of glowing colour.