This little gem belongs to the spring garden, and should be the companion of the Dog’s-tooth Violet, the Crocus, and the Snowdrop. It will grow in any soil, and will produce an abundance of its violet-tinted white flowers, which, when handled, emit a faint odour of garlic. As a pot plant for the Alpine house it is first-rate. In the open, plant in October two inches deep.
TRITONIA
Tritonias are more showy than the Ixia or Sparaxis, but belong to the same group of South African Irids, and require the same treatment. They may be planted out in April, if prepared for that mode of cultivation by putting them in small pots in November or December. It is not advisable to tie them to sticks, for they are more elegant when allowed to fall over the edge of the pots, and suggest the ‘negligence of Nature.’
TROPÆOLUM
T. tuberosum.—A few of the tuberous-rooted Tropæolums are hardy, but it is not wise to leave them in the ground, for damp may destroy them, if they are proof against frost. They are all graceful trailing plants, adapted for covering wire trellises, and may be flowered at any season if required, though their natural season is the summer. The compost in which they thrive best is a light rich loam, containing a large proportion of sand. The stems are usually trained on wires, but they may be allowed to fall down from a pot or basket with excellent effect, to form a most attractive tracery of leafage dotted with dazzling flowers. The sunniest part of the greenhouse should be devoted to the Tropæolums, and special care should be taken in potting them to secure ample drainage.
T. speciosum.—This showy variety is quite hardy, and is largely grown in Scotland where it may frequently be seen on cottage walls. The roots may be planted in either spring or autumn, and a moist, somewhat shaded position best suits the plant.
TUBEROSE
Polianthes tuberosa
This bulb is extensively grown in the South of France for the delicious perfume obtainable from its numerous pure white flowers. In this country it is widely known, but considering the beauty and exceeding fragrance of the blossoms it is astonishing that a greater number are not planted every season. Perhaps the fact that the bulbs are valueless after the first year may in a measure account for the comparatively limited culture. They are easily flowered as pot plants in a mixture of loam and leaf-mould, plunged in a bottom heat ranging between 60° and 70°. The growth is rather tall, and unless kept near the glass the stems become unsightly in length.