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This is a good time to over­haul your plant­ing if you have bor­ders or mixed per­ma­nent plant­ing any­where.

Vig­or­ous peren­ni­als can spread more widely than you want, per­haps smoth­er­ing less rugged plants. Age­ing peren­ni­als can also lose vigour if not lifted and split.

Dig out any clump-form­ing plants that have be­come too large. Break them down, re­mov­ing from the out­sides of the clump. Those are the youngest and most healthy parts of the plant.

Make sure each di­vi­sion has roots and shoots. Plant them where you want them to flower over the next few years.

This ap­plies to peren­nial asters, bor­der phlox, talll se­dums, ori­en­tal pop­pies,, hardy salvias and oth­err clump-form­ing peren­ni­als.

Vig­or­ous clump for­m­erss such as Rud­beckia fulgida, pic­tured right, Achil­lea and spring-bloom­ing pul­monar­i­ass may ben­e­fit from be­ingg di­vided ev­ery sec­ond year.

Bor­der chrysan­the­mumss will also pro­duce bet­terr qual­ity flow­ers on stockyy stems if di­vided fre­quently.

Creep­ing or ground- cov­err peren­ni­als may spread fur­ther than you want, so keep them within bounds. Tall Ja­pane­see anemones, spread­ingg cranes­bills, Ajuga, Lami­umm and other ground cover plantss can be left to their ownn de­vices for sev­eral years. Butt even they may ben­e­fit fromm hav­ing old plants re­moved.


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