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Pot up petunia plants and grow them on in warm frost-free conditions for transplanting later on. Alternatively, plant plugs directly into flower pouches.Pinch out the growing tip of each stem to encourage branching and form a bushier plant which will produce more flowers later on. When all risk of frost has passed, gradually acclimatise them to outdoor conditions over a period of 17 to 20 days, before transplanting them outdoors into baskets, window boxes and containers in well drained soil, in full sun. Follow the instructions illustrated in the image for selecting healthy seeds