I have Shasta daisies that are three years old and close to five feet tall. Is there any way they can be trimmed back and still bloom? I have tied them up but they still fall on the ground.
How much sunlight do they get? If they are in partial shade, sometimes they will grow taller than normal and they may be a little weaker. They could also simply be too crowded. Cutting them back now will reduce the blooms, but they can bounce back with new blooms later in the season. Another option would be to use perennial stakes. These should be used on tall growing perennials annually to help keep them upright. The ring types are easiest to apply as the plants begin growing in the spring, but there are others that can be used around the plants. This fall, or next spring, consider digging and dividing the plants. Hopefully this can help control size. Trimming before blooming can delay flowering, but pruning immediately after the first flush of flowers will slightly delay more blooms, but you should still get some.
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