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Petunias can be planted outside from early May, once all danger of frost has passed. We recommend planting three or four plugs in a 30cm diameter basket or pot for a full display come June. Plant in a hole deep enough to accommodate the plug. Use freshly prepared soil or a balance potting compost when planting.1.Look for signs that petunia blooms are beginning to fade and die.2.Remove, or deadhead, the petunia plant by hand.