Which Plants to Grow in Different Types of Greenhouses

Plants to Grow

A greenhouse greatly enlarges the scope of your gardening, but it is important to decide on the warmth you can provide and the type of crops or plants you wish to grow. 

For convenience it is usual to break down the temperature ranges for a greenhouse into three groups, depending on the minimum night temperature that can be maintained: 

Kaffir-lilies-Schizostylis-coccinea Cold greenhouse: 1°C (34°F)

Cool greenhouse: 7°C (45°F)

Warm greenhouse: 16°C (60°F) 

Having settled on the temperature range  which should be maintained even in the most severe weather  it is possible to consider the best plants to grow.


Cold Greenhouse

Normally no artificial heat is used, protection being provided by blinds, mats or newspapers if necessary in very cold weather. Double glazing reduces heat loss, but is expensive and cuts down light at a crucial time of year. Lining with polythene may, however, be of benefit provided condensation does not become a problem in consequence. 

The limitations of temperature mean that the plants you can have in flower in winter will be confined mainly to those that bloom naturally at that time, and in the early spring months. 

Primula-juliae Spring-flowering plants to grow include: Primula juliae, P. allionii, auriculas, pansies (Viola x wittrockiana), violets (Viola spp), saxifragas, Kaffir lilies (Schizostylis coccinea), and many bulbous subjects such as crocuses (Crocus spp), cyclamen, daffodils (Narcissus spp), fritillarias, hyacinths (Hyacinthus), irises, narcissi and snowdrops (Galanthus nivalis). 

Showy flowering shrubs in pots include brooms such as Cytisus kewensis and C. praecox, forsythias, heathers (Erica carnea, now more correctly E. herbacea), and Viburnum carlesii. 

Summer-flowering plants to grow include: annual plants in variety, cannas, carnations (Dianthus caryophyllus), pelargoniums, fuchsias, and verbena. Summer-flowering bulbs include hot water plants (Achimenes spp), African corn lilies (Ixia spp), African harlequin flowers (Sparaxis spp), and vallotas. 

Summer-flowering shrubs to grow include Hibiscus syriacus, fatsias, prickly heaths (Pernettya mucronata), roses (Rosa spp) and hydrangeas. 

perpetual-carnations-Dianthus-caryophyllus Autumn-flowering plants to grow include: perpetual carnations (Dianthus caryophyllus), eucomis, nerines, yellow star flowers (Sternbergia lutea), tritonias, and the Kaffir lilies (Schizostylis coccinea). The Chilean bellflower (Lapageriarosea) and the passion flower (Passiflora caerulea) are good climbers

Winter-flowering plants to grow include: Christmas roses (Helleborus niger), Viburnum fragrans (synV. Farreri ), winter jasmine (Jasminum nudiflorum), and a wide range of bulbs including Iris reticulata and I. Danfordiae.


Cool Greenhouse

Provided a minimum winter temperature of 7°C (45°F) can be maintained, :here is an almost unlimited supply of plants and shrubby subjects available which will ensure the cool greenhouse is always colourful and interesting. 

Hydrangea-macrophylla A collection to provide year-round colour should include azaleas (A. indica), begonias (both fibrous and tuberous types for flower and B. rex for foliage), the slipper flowers (Calceolaria spp), cannas, chrysanthemums, cinerarias (Senecio cruentus), flame nettles (Coleus blumei), cyclamen, heaths (Erica hiemalis and E. gracilis), fuchsias, Hydrangea macrophylla, busy Lizzies (Impatiens spp), kalanchoe (particularly K. carneo, K flammea, and K. blossfeldiana ), Chilean bellflower (Lapageria rosea), pelargoniums, primulas (P. obconica, P. malacoides, P. sinensis, and P. kewensis), and the ever-popular African violet (Saintpaulia ionantha).


Warm Greenhouse

A warm greenhouse, where 16°C (60°F) can be maintained, is suitable for all the plants suggested for the cool house, plus many other beautiful plants. 

The flamingo plant (Anthurium andreanum) has interesting flowers in shades of pink and red, and often decorative leaves. Aphelandra squarrosa also has handsome leaves and flowers. 

Cymbidiums are among the easiest orchids to cultivate, and are well worth growing for their lovely flowers from March to May; they like a peaty compost and plenty of moisture during the growing season. 

Caladiums and Cordyline terminalis (now C. fruticosa) are both notable for their coloured foliage. 

Crossandras, which come in several colours, can produce spikes of flowers with showy bracts for most of the year, while Columnea banksii freely produces its brilliant red flowers on trailing stems throughout summer. 

Also noteworthy for simple warm greenhouse culture are Jacobinia pauciflora, scarlet and yellow; Jacaranda ovalifolia, with fern-like leaves and lavender-blue flowers; Boronia mega-stigma, fragrant foliage; Hibiscus rosasinensis, rose-red; and Streptosolen jamesonii, an evergreen climber with orange-red flowers.

09. October 2010 by admin
Categories: Greenhouse Gardening, Plants | Tags: | Comments Off on Which Plants to Grow in Different Types of Greenhouses


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