Greenhouse Gardening The Second Half Of The Year

Potting on (i.e., moving a plant to a larger pot) of seedlings of cyclamen, primulas, cinerarias, etc., is work that must not be delayed.

Carnations, ripening tomatoes, cucumbers, and other greenhouse crops are popular inhabitants of little greenhouses at this season. Many greenhouse annuals should be in flower.

Plenty of ventilation without draughts, and shading where needed are important.

The blue African lily (agapanthus), heliotropes, plumbago capensis (towards the end of the month), lilies and passion flowers are with us in August, side by side with pots of annuals and gladiolas.

August is a busy month where propagation is done on a large scale. All sorts of half-hardy plants such as heliotropes can be propagated from cuttings struck now under glass, and later grown on in the cool greenhouse for early flowering next season.Greenhouse Gardening Advantages

Freesias, and as soon as supplies are available, the Roman hyacinths and narcissi, wanted for Christmas flowering will be potted now.

Potting on into flowering pots will be required among cyclamen, cinerarias, chrysanthemums, and many other greenhouse plants.

August flowers continue into September, and are joined by the earliest of the greenhouse chrysanthemums and some of the late flowering heaths. Fuchsias are looking well this month, and such annuals as ricinus are glad of the shelter of the greenhouse towards the end of September.

Less overhead moisture, and possibly more heat, with shading removed, will be the chief alterations in procedure now.

All climbers, shrubs, and other plants that have finished flowering should be trimmed back and relegated to some part of the greenhouse where sunlight is less plentiful, while the lightest shelves will become occupied by chrysanthemums, winter-flowering carnations and other winter-flowering subjects.

More cuttings can be taken, and more bulbs must be potted up for early flowering. Stocks, pansies and other annuals sown in the garden in summer can be potted up to flower under glass.

Vegetables such as cauliflowers, etc., can now be sown as desired.

Begonias crinums, camellias, and a blaze of chrysanthemums keep the October greenhouse gay.

Sweet peas can be sown now under glass to winter in the cold frames; arum lilies, and still more spring bulbs, including the bulbous irises, ixias, etc. can be potted up. Some of the shrubs— e.g. roses—to be flowered under glass can now be brought indoors.

Salads can be sown, and the first roots of rhubarb forced.

Chrysanthemums rule the greenhouse in November, though there are still some annuals, begonias, and the late pots of salvia that are gay. Salvia splendens and the scarlet schizostylis are two brilliant subjects for the November greenhouse. Lilies of the valley can be potted for forcing, and plants such as dielytra, spira-a, azaleas, may be potted up also for early flowering under glass.

French beans, and small salads, can be sown, but only where plenty of heat is available. Salads that grow slowly are barely eatable. Seakale, etc., can be forced.

The first of the spring bulbs—narcissi paper white and Roman hyacinths—fill the greenhouse shelf in December. The earliest of forced shrubs are also coming into bloom, and Christmas roses (Helleborus niger) growing under hand lights or in the frames are opening their buds. More chrysanthemums and begonias and winter carnations are in bloom.

The early flowering bulbs can be brought gradually into more heat and forced into early flower. More potting of lilies of the valley for succession, and a start with the forcing of the main supply of small potted shrubs such as deutzias, lilacs and roses can be made.

A minimum temperature of 40 degrees should be aimed at in any greenhouse, and sharp watch kept for pests or diseases.

Fruits under glass are restarted into growth, and strawberries in pots are brought into the greenhouse now for early supplies.

The reader who has patiently read through the above resume of greenhouse operations will have gathered that to take charge of a single greenhouse is an exacting task. If a constant succession of loveliness is our aim, we must be prepared to keep our plants ever on the move. This means also that space must be strictly apportioned and used always to the best advantage.

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