Depending on the variety of
purpletop vervain, it can grow between 10 to 140 cm in height and 2 m wide in its spread.
The
purpletop vervain will bloom from the beginning of summer until the middle of winter, when the first frost arrives. Because of the
plant's large amount of bloomage, it can quickly start to look a little disheveled if not pruned regularly. To avoid this, prune every month in the summer. Throughout the rest of the year, consider pruning your
purpletop vervain twice each season if it requires it.
During summer, when the
plant is in bloom, trim back any spent flowers or withered foliage. If regularly pruning, trimming back by 2.5 to 5 cm each time will help to maintain your
plant's shape. Also, pinch tips to encourage more abundant blooms in other areas of the
plant. Avoid removing over a third of the
plant overall, as this may affect flowering in the future.
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