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GardeniaA tender evergreen or semi-evergreen flowering shrub that requires greenhouse treatment in the UK The scented flowers appear in late June to August. Some may flower during the winter months if grown in a warm well lit spot. They can grow to a height of 1.2 metres (4ft) with a similar spread. During the winter months they require a minimum temperature of 12°C (55°F) and should be kept just slightly moist. In summer, water the plants freely, and feed every two weeks with a liquid acid fertilizer from May till October. Plants can be placed outdoors for the summer months (June-Sept) If kept in the greenhouse, keep the atmosphere humid by damping down the floor/ground beneath them. Avoid direct sunlight, shade if necessary, and if the temperature rises to say 18°- 20°C (65°- 70°F) ventilate the greenhouse more. Week 2; Sow seed in pots/trays of seed compost and germinate at 21°C (70°F) Germination will take around 4-5 weeks. Week 4; Pot up seedlings from previous year into 100-125mm (4"-5") pots of potting compost and grow on in a frost free environment. Ensure they get maximum light but not direct sunlight. Week 10; Take heel cuttings from non flowering lateral shoots, and root at a temperature of 18°- 20°C (65°- 70°F) Once rooted pot up the cuttings into individual 70mm (3”) pots and grow on at the same temperature. Week 12; Prick out seedlings into 70mm (3") individual pots of potting compost and grow on in a frost free environment. Ensure they get maximum light but not direct sunlight. Week 15; Re-pot established plants annually, until they are in 200mm (8”) pots. Week 30; Pinch out the growing tip of the cuttings to promote bushier growth. Week 35; Generally pruning only amounts to keeping the plant tidy and nicely shaped. Prune back new growth of established plants by half or two thirds after flowering.
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