Answer: Most perennials are self supporting, however some such as peonies, most tall border phlox, hollyhocks, delphiniums and other upright plants may need to be staked in order to stay upright epseically when heavy with bloom. Additional reasons for them to lean would be lack of light and oversupplying them with nitrogen which causes weak growth. Many types of perennials also splay outward if they need to be divided, or if they have not been deadheaded and/or cut back after blooming. You might look back at the basic cultural requirements of your plants and see if you can trouble shoot that way. Alternatively, simply select low growing plants.
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