perennialize

perennial +‎ -ize

perennialize (third-person singular simple present perennializes, present participle perennializing, simple past and past participle perennialized)

1. (botany, intransitive) To return year after year as a perennial.
   • 2000, Tom Peace, Sunbelt Gardening: Success in Hot-Weather Climates (page 64)

     I recommend spending your bulb budget on bulbs that will perennialize in the garden, and if you need big tulips, purchase a bunch from the local florist.

2. (botany, transitive) To make perennial.
   • 2007 June 5, Jim Robbins, “A Perennial Search for Perfect Wheat”, in New York Times‎:

     The quest here is one of several around the world, to perennialize everything from sorghum to chickpeas to sunflowers.