The Culture Of Vegetables And Flowers From Seeds And Roots Part 26

Both the double and the single cla.s.ses of Dahlia are increasingly grown as annuals from seed, and this practice has the great advantage of being economical in time and in the saving of s.p.a.ce during winter. The seedlings grow freely and quickly, and will flower quite as early as those grown by the more lengthy and troublesome method from tubers. Even those who possess a stock of named sorts may with advantage raise a supply from seed, especially as there is a probability of securing some charming novelty, which is in itself no small incentive.

Although the Dahlia is a tender plant, it is easily managed in a greenhouse, or in a frame resting on a hot-bed. The seed may be sown as early as January, but unless sufficient s.p.a.ce is at command to keep the plants stocky as they develop, it will be wise to wait until February. A sowing in the month last named will produce plants forward enough to bloom at the usual time. Even March will not be too late; but whatever time may be chosen, when the start has been made it must be followed up with diligence, so as to avoid giving any check from first to last. Sow thinly in pots or pans filled with ordinary light rich compost, and cover the seed with a mere sprinkling of fine earth. When the first pair of leaves attain the height of an inch, pot off each plant singly close up to the base of the leaves. It is not advisable to throw the weakly seedlings away; these are the very plants which are most likely to display new shades of colour and they are worth some additional trouble.

Although weak at the outset, they may, by judicious treatment, be developed into a thriving and healthy condition.

When potted, place the plants in heat, giving a little extra care until growth is fairly started. In due time s.h.i.+ft into larger sizes as may be necessary, and then it will be wise to consider whether there is s.p.a.ce to grow the whole stock well. If not, do not hesitate to sacrifice the surplus, and in doing so reject the rankest-growing specimens, for these are least likely to produce a fine display of bloom. It is mistaken practice to take out the top shoot, as this checks the plant for no good end; but when about six inches high, each one will need the support of a stick. Give water freely, and air on all suitable occasions. The least tendency to curled leaves indicates something amiss, and demands immediate attention. A cold blast may have stricken the plants, or the soil may be poor; lack of sufficient water will produce the mischief, or it may arise from the presence of aphis. If the last-named a.s.sumption prove correct, fumigate on the first quiet evening, and omit watering on that day. The mere mention of the other points will be sufficient to show the remedy for them.

As the time for transfer to the open air approaches, all that is possible should be done to harden the plants for the change. They may be placed for a few days under the shelter of a wall or hedge, but on the least sign of frost be prepared to protect with hurdles or mats. Full exposure during genial showers and fair weather is advisable, and an occasional examination of the plants will prevent their rooting through the pots into the soil.

The border for Dahlias can scarcely be made too rich, for they are hungry and thirsty subjects, and will amply repay in a profusion of bloom the manure that may be lavished upon them. Slugs and snails are unfortunately too partial to newly planted Dahlias, but the vermin soon cease to care about them; therefore it is advisable to plant Lettuces plentifully at the same time, or previously, on the same ground, and to dust around the Dahlias with lime. Insert at least one stake, about a yard long, near each plant, to give support, and two or three others will have to be given before the branches spread far. Secure the first shoot when planting is completed, and follow up the tying as growth demands.

Dahlias bloom continuously for a long time, and appear to be especially at home in the shrubbery border, or in the centre of a bed. They are also valuable for training against buildings having a southern aspect, and here the flowering period is much prolonged, for an early frost will scarcely reach them. A light wall is an admirable background for deep-coloured varieties, and the white or yellow flowers are displayed to advantage against a dark building. Dahlias may be used either alone or in company with the climbing plants which are usual in such positions.

The flowers possess a special value for indoor decoration, and any odd corner of the garden can be utilised for producing a supply for this purpose. Cutting should invariably be done in the early morning, while yet the dew is upon them. They will then retain their beauty for a longer period than those taken at a later hour from the same plants.

This remark is true of all flowers, but it applies with especial force to the Dahlia.

==DAISY, DOUBLE==

==Bellis perennis fl. pl. Hardy perennial==

The remarkable development of the Double Daisy in recent years has raised this simple garden subject to the foremost rank of spring bedding plants. So p.r.o.nounced has been the improvement achieved in the size and form of the flowers, that plants raised from a reliable strain of seed will now produce blooms which may well be mistaken for specimens of finely shaped Asters. When ma.s.sed in a large bed the flowers present one of the most striking sights to be seen anywhere in the spring garden.

But apart from their use in formal beds and borders, Double Daisies make a pleasing break among Wallflowers, and are particularly attractive when grown as an edging to bulbous flowers and other spring-blooming subjects such as Polyanthus, Myosotis, &c. Plants from a sowing made in pans in April and put out when large enough, may be flowered in the autumn of the same year. But the method more generally practised is to sow on prepared beds in the open during June or July, and to transfer the seedlings when sufficiently developed to positions for blooming in the following season.

==DELPHINIUM==

==Hardy perennial==

Nearly all the perennial varieties may be raised from seed, and where large numbers are required this is the best method of obtaining them.

They make handsome border flowers, and are extremely valuable during the early months of summer. Sow in May, June or July, in the open ground, and transplant in autumn. If mixed seed has been sown, it will not be wise to thin out all the weakly plants, or it may happen that some of the choicest shades may be lost. The first flowers will be over by midsummer, but if the stalks are promptly cut down instead of being allowed to seed, there will be a second display later in the year.

Three varieties, Queen of Blues, Dwarf Porcelain Blue, and Blue b.u.t.terfly, may be flowered as annuals, by sowing in pans in March and transplanting to the open as soon as the seedlings are ready. They also make particularly charming pot plants, for which purpose it is advisable to sow seeds in March.

The scarlet variety (=D. nudicaule=) is rather more delicate than the others, and it is wise to raise the plants in well-drained seed-pans, and to take care of them through the first winter in a cold frame; indeed, in a heavy soil there is a risk of losing them in any winter which is both cold and wet. It is not necessary to employ pots, but immediately after flowering take them up and store in peat until the following April, when they can be returned to the open ground.

=D. sulphureum.= The seed takes a very long time to germinate, and severely taxes the patience of the sower. But otherwise there is no difficulty in raising plants, and the long spikes of beautiful clear sulphur-yellow flowers are well worth the extra time the seedlings need.

The best plan is to sow in autumn in the open ground, cover with a frame, and avoid disturbing the soil, except for weeding, until the next autumn, when the plants should be put into position for flowering in the following summer.

As slugs are exceedingly partial to Delphiniums, the crowns should be examined in spring, and the seed-beds may be dressed with soot and surrounded with ashes to save the seedlings from injury.

The annual Delphiniums are dealt with under Larkspur, page 274.

==DIANTHUS==

==Pink. Biennials, hardy and half-hardy==

Many varieties of Dianthus claim attention for their elegant forms and splendour of colouring. They have been so wonderfully improved by scientific growers that they almost supersede the old garden Pinks, and have the great advantage of coming true from seed. =D. Heddewigii= (j.a.pan Pink) and its varieties, =D. chinensis= (Indian Pink) and =D.

imperialis=, make interesting and sumptuous beds, and may all be flowered the first year from sowings made in heat in January or February. Immediately the seedlings are through the soil it is important to s.h.i.+ft them to a rather lower temperature than is necessary for insuring germination, or the plants become soft and worthless. Be very sparing with water, especially if the soil is at all retentive. When two leaves are formed, transfer to pans, allowing about an inch between each plant, and place in a sheltered position. Gradually introduce to cool treatment, and when ready p.r.i.c.k off again, allowing each plant more s.p.a.ce. They will thus have a much better start, when planted out in May, than if taken from the seed-pans direct. Dianthus make a most attractive display in pots, and a number of seedlings should be potted on for flowering in this manner.

Where there are no facilities for raising Dianthus in heat, it is quite easy to grow plants in an open spot from a sowing in June or July, and they will flower freely in the following year. Prepare drills about six inches apart and line them with sifted soil; sow thinly, and carefully cover the seed with fine soil. Shade must be given during germination, but it should be gradually withdrawn when the seedlings are up. Transfer to final positions in August. Should this be impossible, p.r.i.c.k the plants out, and s.h.i.+ft them again a little later. It will only do harm to leave them crowded in the seed-bed, and the second move will better enable them to withstand winter frosts. The Dianthus thrives in a sandy or loamy soil, with full exposure to suns.h.i.+ne, and the plants scarcely need water or any attention the whole season through.

==DIGITALIS==

==Foxglove. Hardy biennial==

Besides the native Purple Foxglove, largely grown in gardens, there are several very handsome varieties that are valuable for adorning borders, shrubberies and woodland walks. Specially worthy of attention are Giant Primrose, a beautiful variety with rich cream or buff flowers; the Giant Spotted, which produces handsome flowers, rich and varied in colour; and the white variety with its abundance of charming ivory-white bells, which are occasionally slightly spotted.

Any deep rich soil suits Digitalis, and seed sown in May, June, or July will produce seedlings which, with very little attention, will yield a fine display of flowers in the following summer. Sow in the open in pans, or on a prepared border, and put the young plants into permanent positions, choosing showery weather in August or September.

==DIMORPHOTHECA==

==Half-hardy annual==

The Dimorphotheca, also called the Star of the Veldt, was introduced into this country from South Africa and, like the Nemesia, also a native of that Dominion, it has become one of the most valuable of our summer annuals. Under favourable conditions plants may be flowered in six weeks from time of sowing and they will continue to bloom in profusion until cut down by frost. In addition to the striking orange flower, =D.

aurantiaca= (Orange Daisy), a wide range of colours, including many delicate tints, has been evolved by careful hybridisation.

Those who wish to obtain forward plants should sow during March or April in pans of light soil placed in a cold frame, and the seedlings will be ready for transfer to open quarters in May. Or seed may safely be sown in the open ground in May and June. As suggested by its native habitat, the Dimorphotheca loves a warm sunny position and grows to the greatest perfection in a light soil or a well-drained loam.

The practice of flowering half-hardy annuals in pots is rapidly increasing, and among this cla.s.s of plants the Dimorphotheca has few rivals as a decorative subject for the conservatory. It is more effective to grow three or four plants in a pot than one only, and the best specimens are obtained by sowing direct into the pots and thinning the seedlings to the required number. Use a light rich compost containing a fair proportion of silver sand, and do not let the plants suffer for the lack of water.

==ESCHSCHOLTZIA==

==Hardy perennial==

A decade or so ago the predominant colours found in Eschscholtzias were yellow and orange, but in recent years a number of new and very attractive shades have been introduced, with the result that this plant is now regarded as indispensable for summer bedding and for borders. The modern practice is to grow Eschscholtzias as annuals, sowing in the open during March and April. As the seedlings do not readily transplant, the seed should be put in where the flowers are wanted. Thin out in due course, allowing each plant ample s.p.a.ce for development. Sowings may also be made during September, from which the plants will bloom in advance of those raised in spring.

==FREESIA==

==Half-hardy perennial==

The Freesia is another of the bulbous flowers easily raised from seed, and it may be had in bloom within six months from date of sowing. Use a rich compost, and sow under gla.s.s in January, February, or March, as may best suit convenience. Seed should be sown again in August, to supply flowers in spring or summer of the following year. The brittleness of the roots makes re-potting a hazardous operation. It is therefore wise to sow in 48-pots and thin to four or five plants in each, thus avoiding the need for s.h.i.+fting until after flowering has taken place. When re-potting becomes imperative, it must be done with a gentle hand, and the bulbs ought to be carefully matched for each pot. The position chosen for Freesias should be light and freely ventilated in mild weather, but they will not endure a cutting draught. For further cultural notes see page 328.

==FUCHSIA==

==Half-hardy perennial==

To raise Fuchsias from seed will be new practice to many; but it is both interesting and inexpensive, and every year it secures an increasing number of adherents. Seed may be sown at almost any time of the year; if a start be made in January or February, the plants will bloom in July or August. Soil for the seed-pots should be somewhat firm in texture, but a light rich compost ought to be employed when the plants come to be potted off, and the final s.h.i.+ft should be into a mixture containing nearly one-third of decayed cow-manure. For the early sowing we have named, a rather strong heat will be necessary to bring up the seed. When large enough to handle, p.r.i.c.k off the seedlings round the edges of 60-pots, putting about six plants into each pot. Shade and moisture are requisite to give them a start after each transfer. Subsequently they must be potted on as growth demands, until the final size is reached; and flowering will not commence so long as increased pot-room is given.

The growth must not be hurried, and the plants should at all times be kept free from vermin. Seedlings having narrow pointed leaves may be consigned to the waste heap without scruple; but plants with short rounded foliage, especially if dark in colour, are almost certain to prove of high quality.

==GAILLARDIA==