Check for greenfly, plus snails love munching on the new shoots and another pest is weevils in the pot soil they eat roots, when planting in the ground, remove as much of the plant pot soil as possible from the roots in case any pests. Plant giving a good watering with plant feed and a spray or watering with a pest deterrent, try placing some straw around the base of plant or gravel stones as slugs or snails don’t like crawling over them.