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Heated greenhouses are essential for raising half-hardy annuals (summer-flowering bedding plants) in spring. Several forms are available, including ‘even-span’, ‘lean-to’ and ‘miniature lean-to’, as well as partly glazed sheds. With all of them, good ventilation is essential, as well as adding warmth in late winter and spring. Remember that the larger the greenhouse is, the easier it will be to achieve a uniform and even temperature (but it will also be more expensive to heat).

Even-span: orientate the ridge east to west

Lean-to: position against a warm, sheltered wall

Mini-type: secure to a wall that is sheltered from wind

Glazed shed: orientate the glass towards the sun