Hort Q&A: Landscape plants to consider Carla Smith, horticulture educator Pottawatomie County Extension Service With a new season ahead of us, if you are considering new landscape plants, here are some selections to consider. Each year a set of plants is chosen by horticulturists that will help consumers choose plants appropriate for Oklahoma gardens. The program began in 1999 by selecting a tree, shrub, perennial and annual worthy of Oklahoma landscapes. Now in its 23rd year, there are many plants to choose from. To see all the plants recommended by the Oklahoma Proven Plant Selection Program, visit our website at http://oklahomaproven.org/. I will feature one plant per month to let you all see some of these recommended varieties selected for 2021 in more detail. March is a good month to plant trees, as roots can establish before warm weather.