Plant
Oklahoma trees, shrubs and other permanent plants can still be planted.
Cultivate your Oklahoma beds to get rid of weeds.  If you have a lot of weeds, cover the bed with 5 sheets of newspaper and top with compost.
Begin warm season crops like lettuce, cauliflower, peas, radish, potatoes, spinach and onion. read article on [...]

Plant
Oklahoma gardeners will want to take advantage of this month being an excellent month to plant bare rooted trees, shrubs, ground covers, vines, plants that are permanent. 
Begin vegetable garden with cool season plants like onions, radishes and potatoes (see article on the Best onions and potatoes for Oklahoma gardeners).
Finish up transplanting
Fertilizer
If you have [...]

Plant All remaining daffodils and tulips that were not planted earlier. Oklahoma Red Dirt Bulb Planting 101
Transplant all remaining shrubs that need to moved.
Trees, shrubs, and vines.

Fertilizer Organic fertilization of newly planted trees [...]

 
Plant
Container grown shade trees and shrubs.  (see Red Dirt Gardening’s article on "Proper Tree Planting").
Transplant shrubs or vines that need moved.
Fertilize
Easy to pull henbit and clover that might emerge this month. 
Apply broad weed herbicide to well established cool and warm season lawns.
Prune
Evergreens to improve their appearance and natural shape. (see Red Dirt Gardening’s "Pruning [...]

As the Oklahoma weather cools and winter approaches my yard and garden are dominated by the deep crimson of the Japanese maples and the firey reds of the dwarf Nadinas, who until now have been green.  Yellow and orange leaves of the trees now fall upon the yard as the deep greens and blues of [...]

Plant

Mums, pansies, kale, dianthus.
Cool season veggies like garlic, cabbage, beets, carrots, lettuce, turnips.
Container grown shade trees and pines. 
Seed cool season lawns. 
Dig and store any tender bulbs that you have. 
Fertilize
Fertilization of Bermuda lawns should have been completed mid September. Do no fertilize Bermuda until next spring.
Great time to begin controlling broad leaf weeds with [...]

August for Oklahoma lawns and gardens can easily be summed up with one word, WATER.

Plant
Divide and replant any spring blooming perennials.
Finish any last minute planting of fall vegetables in your Oklahoma Garden.
Mums and asters
Fall bulbs like amaryllis and crocus.

Fertilize
Bermuda lawns if adequate moisture is available
Young trees and shrubs
Foliar feed your Oklahoma [...]

Plant
Color for fall such as asters, cosmos, marigolds, morning glory, ornamental grasses, zinnias.
Establishment of warm season lawns should be completed by the end of this month to ensure the least amount of plant damage caused by winter kill.
Fertilize
Roses to encourage fall blooms.
Planting beds that were not fertilized in June.
Bermuda lawns for the 4th out of [...]

Plants
Spring bulbs, tulips, daffodils and hyacinths. (see Red Dirt Gardening article on Fall Bulb Planting 101)
Fertilize  
Worm casting are gentle fertilizer to be use with bulbs.
Cool season turf can be fertilized during the first week of November. 
Use 1/2 rate of organic fertilizer like Sustane.
Scale insects can still be treated as long as the temperature is above [...]

Plant
Cool season grasses can be planted through the middle of the month. Fall is the best time to plant ryegrass, bluegrass or fescue. Planted by way of seed, these grasses are good for shade areas. Remember they do require mowing through spring. Throughout the fall and winter you will also need to fertilize and water
Use [...]