Advice
Planting up tubs and containers
Container-grown
plants need more care and attention than those grown in open
ground, but they are often the only way city and flat-dwellers
can create gardens. Although containers restrict root development,
they can encourage vigorous plants to flower and fruit earlier,
restrict otherwise over-large plants, and allow plants with
specialist soil requirements to be grown.
Choosing containers
Chose containers just large enough to hold the roots of single specimens. Small pots dry out quickly, so very small plants are best planted in groups. Line with polythene to conserve moisture, slitting the lining base to prevent waterlogging. Ensure adequate drainage by selecting only pots with drainage holes and placing crocks or polystyrene blocks in the bottom. If possible raise the pots up on small blocks to guard against waterlogging.
Composts
Short-term plants:
Use soil-less composts.
Permanent plantings:
Use soil-based composts (e.g. John Innes No 2)
Lime-hating plants:
Use ericaceous composts
You can also add water-retaining granules and slow-release fertlisers to the compost before planting up. Don't over-apply these products, only using doses stated in the manufacturer's instructions.
Planting
and aftercare
Plant permanent specimens in early spring to encourage rapid establishment; plant summer-flowering plants in May.
Check compost moisture levels daily from April to September, and water thoroughly when dry. Reduce watering during winter months, and to prevent the compost from freezing move containers under cover or wrap them in bubble-wrap. In very wet periods move pots under cover if the compost becomes sodden.
Feed
plants four to six weeks after planting, unless the compost
contains controlled-release fertilisers. From April to September
use a general-purpose liquid feed. Feeding isn't necessary
during winter.
Re-pot in early-spring as required, otherwise top-dressing with new compost.
Further information
Peat and the gardener - helpful guidelines on the use of peat in the garden.