HOrT COCO-UC Master Gardener Program of Contra Costa

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Plants in the nursery

Choosing Landscape Plants

October 19, 2026
By Help Desk Team
Fall is a great time to add plants to your landscape. The soil is warm, temperatures have moderated since summer, and rain is just around the corner. The first question is what do you want to plant? Then, how do you select the plant at the nursery? And finally, how do you put it in the ground?What plants…
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Leaves on the ground
HOrT COCO-UC Master Gardener Program of Contra Costa: Article

Save Fallen Leaves for Garden Mulch

September 20, 2026
By Help Desk Team
Autumn is just around the corner, and soon the leaves will start to fall. This fall, instead of raking up the leaves, put them to work as a natural mulch suppressing weeds, protecting the soil from erosion, retaining soil moisture, returning nutrients to the garden, and sheltering over-wintering insects and…
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Bunch of carrots

Fall is Coming - Planting Root Vegetables

August 23, 2026
By Help Desk Team
One of the special things about our Mediterranean climate is being able to grow edible plants year-round. Even as we are harvesting beautiful tomatoes, in August it’s time to start planning for cool weather gardens.There is a long list of cool season vegetables, including lettuce, brassicas like broccoli,…
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Plastic bottles of horticultural oils

Horticultural Oils for Insect Control

July 27, 2026
By Help Desk Team
Note: This was originally published in the Contra Costa Times. It has been updated.Horticultural oils are lightweight oils, either petroleum or plant based, that can be an effective and low toxic choice for managing certain insect and mite pests. What you find on the shelf of your local retailer may be…
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Fertilizer burn on cabbage leaves

Watch Out for Phytotoxicity

July 5, 2026
By Help Desk Team
Phytotoxicity (phyto relates to plants) is the name for damage to plants caused by chemical substances. This is the time of year we hear about plants with blotches or splotches on leaves, curling leaves, or other deformities. If you have recently sprayed your plants and are seeing problems on the leaves,…
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