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Greenhouse
basics
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Typically, this is composed of timber or
alloy supports and stands about 75cm (2ft 6in) high and 60cm (2ft) wide. The
most user friendly form is tray staging. This method also incorporates
capillary matting or coarse grit base on which to stand the pots. Tray staging
will also allow for higher humidity around the plants which is beneficial
during summer.
The space beneath staging is
valuable, not merely for storage, but for shade-loving plants, for bringing on
bulbs or for striking certain cuttings.
In a multipurpose greenhouse,
just over half the growing area might be dedicated to staging, allowing space
for a propagator and seedling bench as well as for the larger pot plants.
A propagator, with a low voltage soil warming element, will add
enormous value to your greenhouse, not only helping with early seed sowing, but
also for rooting soft cuttings throughout summer and for hardwood cuttings in
autumn and winter.
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At ground level, a
greenhouse bed can be prepared. To work well, this should be built up with
compost or well rotted manure, perhaps with a timber retaining edge to prevent
soil from falling into the aisle. As well as such temporary crops as aubergines
and tomatoes, more permanent plants such as a peach or grapevine could be
planted here.
If possible, plant your grapevine in bare soil outside the
greenhouse, leading its main stem through the side of the greenhouse. This will
enable a wider, cooler root-run and will reduce the risk of mildew on the vine
leaves.
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With intense cropping, soil
in a greenhouse bed can become disease-ridden and cause problems. If this
happens, remove the soil to a depth of at least 45cm (18in) and distribute it
elsewhere in the garden - it will do no harm outdoors - and replace with fresh
soil blended with manure or compost.
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A typical all
purpose greenhouse
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