Gardener's Checklist | Winter Guide


Welcome to our Winter Gardener's Checklist! This series features suggestions for keeping your garden in tip top shape.

Even in the middle of winter, California gardeners can stay busy this season with plenty of plants and trees needing pruning. Just remember that the days are short, so you have fewer hours to garden than you might like. 

A little environmentally friendly dormant oil applied now will help eliminate many of summer's pests. And while rainfall may be more likely in February, when it does rain, be sure to stay out of garden beds to avoid damage to the soil and precious space for plant roots.



  • ‚ÄčPlant Cool Season Flowers & Shrubs

If you haven't already, fill in bare spots with cool season annuals such as pansies, snapdragons, calendulas, foxgloves and Icelandic poppies as long as temperatures are consistently between 35 and 85 F. Azaleas and Camellias are also at their peak right now. Wait to plant more delicate perennial herbs, flowers and ground covers until the region's last average frost date. This can vary between mid-February to early March for the San Gabriel Valley.

  • In Case of Rain

If it does rain, be sure to stay out of garden beds when soils are wet. Walking on wet soils seriously compacts them, squeezing out the necessary open spaces that allow roots to breathe.

  • Continue to Harvest Crops

Keep up with the harvest of cool season crops such as peas, lettuces and spinach as it will enourage more production. Continue to plant successions of these fast-growers for ongoing harvest over the next few weeks.

  • Watering

In low frost areas, keep plantings well-watered so whenever freeze threatens, plants are more likely to survive. A well-hydrated plant is better equipped to recover than a dehydrated plant.

  • Smart Pruning

Prune deciduous trees and shrubs once they've gone dormant and dropped their leaves. As a rule of thumb, prune flowering plants within a month after they stop blooming, but be careful not to trim off developing buds! Now is also ideal time to prune evergreens.

Cut back dormant grapevines, wisteria and roses. For the warmest regions, you may even prune your roses back to just 6 to 8 inches to stimulate new growth. Remember to spray your roses and deciduous fruit trees with horticultural oil to prevent insect problems later.

Finally, if a plant is damaged by frost, resist the urge to prune the damaged parts. They may well protect the rest of the plant during the next frost.

  • Lawn Fertilizer

Fertilize cool season lawns such as ryegrass, bluegrass and fescue. Mow your lawn regularly to control weeds and keep grass thick and healthy. During cool weather, all lawns should be kept at around 2 inches. All lawns will benefit from an application of crabgrass preventer this time of year. Talk to one of our associates about how much to buy and apply.

  • Start a Garden Journal

Holding onto all those gardening catalogs that started arriving? If you haven't already, begin a journal or file to tuck away names of plant you like, magazine pictures, plant labels, seeds or anything else that suits your fancy. Come early spring, garden planning will help you in choosing the best plants for your landscape. 

Glendora Gardens maintains nearly 10 acres of nursery and growing grounds, including carefully arranged plant beds, koi ponds, and shade houses full of creative treasures. We welcome you to come explore the garden, wander among the wildlife, and be inspired!