Horticulture Tips for March

Home Grown  by Keith Reed
It’s been an interesting winter so far with enough cloud cover and cool weather to keep soil temperatures low. If you’re anxiously waiting to plant something, remember soil temperatures are an important component of timing. Proceed with caution over the new weeks. Also remember that our last average freeze date is still six weeks away!
  • Plan to attend the March edition of the Payne County Master Gardeners Tuesday Gardening Series on March 12h at The Botanic Garden at OSU. Topics will be invasive plants and gardening with children. See the contact information below for more information.
  • For landscape beds and garden plots, it is still easy to control winter/spring weeds with cultivation if done soon. Remember, a very small inconspicuous weed is right now can completely dominate the same space one month from now.
  • For homeowners that typically use glyphosate to control weeds on their dormant bermudagrass, the window of opportunity will be closely quickly. Check for signs of early green-up along sidewalks and south facing slopes before attempting to make an application.
  • The same can be said for most dormant oil applications with fruit trees buds beginning to swell. Spraying dormant oil on tender foliage can cause a lot of damage so if dormant oil is on your to do list, do it soon.
  • Preemergent herbicides must be applied before weeds germinate. Crabgrass is our indicator weed for this treatment. A reminder that this weed germinates about the same time that redbud trees or forsythia bushes begin to drop their blooms.
  • March is a good time to fertilize cool season grasses like Tall Fescue. Do NOT fertilize bermudagrass this month.
  • Begin planting cool season vegetable crops like radishes, beets and broccoli.
  • Wrap up cutting back ornamental grasses and liriope very soon. Most of these plants are already actively growing. Look closely before cutting back as you may want to leave a little more height on last year’s growth than normal.
  • Remove any remaining dead plant material from last year’s herbaceous ornamentals. If you don’t have a compost pile yet, now is the perfect time to start one.
  • And finally, NO, you should not plant your tomatoes yet!

For more information on this or any other horticultural topic, you can contact Keith Reed, the Horticulturist in the Payne County Extension office. Keith can be reached via email at keith.reed@okstate.edu, phone at 405-747-8320, or in person at the Payne County Extension office, located at 315 W. 6th in Stillwater.

Oklahoma State University does not discriminate on the basis of race, color, national origin, genetic information, sex, age, sexual orientation, gender identity, religion, disability, or status as a veteran in any of its policies. See Legal Page for more info.
Article Archives