Dividing Newly Purchased Perennials: Risks and the Role of Harpin Protein

Splitting Hostas and Phlox at Planting Time

Dividing new, pricey plants is risky. Hostas and phlox can be split if large enough, but shock may set them back.

Harpin Protein (Messenger)

This plant defense activator (harpin protein) reduces transplant shock and speeds recovery. It's effective but expensive (patented). Use per label if budget allows.

Alternative

Plant whole, let establish a year, then divide next spring. Safer and free.