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Eeek, it's weed season already!

Top 5 problem plants to get rid of while they're small


Seedling of crabgrass weed
Crabgrass is easiest to eradicate when it's about this size. (Photo by  Jack Kelly Clark, courtesy UCIPM)

Bedstraw is the scourge of pet
owners. (Photo: Kathy Morrison)

The only time I envy gardeners living in snow country is late winter. They have white landscapes to look at. We have weeds.

The mild temperatures and just enough rain this time of year have weeds popping out all over. Some aren't even noticeable, tucked under larger plants or hiding for now under loose mulch. But they're there, and the sooner they're dealt with the better.

Why are weeds bad? Well, they suck up nutrients and water that other plants need. They're so well adapted that they spread like crazy. And they provide early food for that other scourge of the garden: "bad guy" insects. I was amazed to learn how many pests migrate from weeds to good plants during the spring.

So keep on top of the weeds and you keep on top of two problems. They're never completely eliminated, but at least they can be kept under control.


Little bittercress weed with white flower
Little bittercress produces pods that can spread seeds
several feet when they pop open. (Photo: Kathy Morrison)

And please, avoid using herbicides to kill weeds if at all possible. Chemicals, especially, can have unknown long-term effects. Integrated pest management is the preferred way to go, for the health of you and your garden. The
UC IPM program offers excellent environmentally friendly solutions to weeds .

Here are just five currently sprouting weeds that are crucial to hoe or dig out early:

1) Catchweed bedstraw ( Galium aparine ), also called cleavers and stickyweed, among others. Its sticky hairs catch on everything: T-shirts, socks, cat fur,  dogs' tails, you name it. And it spreads that way. If allowed to grow large, it forms little burrs that are even harder to pull out of  fur or socks.

2) Little bittercress ( Cardamine oligoosperma ), also known as shotweed or snapweed. I call this weed "pop-bead plant" because of the way the seeds explode out of their seed pod when you so much as brush past it. Dig it up before or while it's flowering to prevent it spreading far and wide.

Puncturevine with flower. (Photo by Jack Kelly
Clark, courtesy UCIPM)


3) Puncturevine ( Tribulus terrestris ), also called goathead. This is the scourge of bicyclists and pet owners.  It produces nasty barbed seeds that can puncture tires and hurt paws.

4) Crabgrasses ( Digitaria ssp.) The smooth-leaf one ( Digitaria ischaemum ) is most often found in turf, the one called large crabgrass ( Digitaria sanguinalis ) most often grows in gardens. Get 'em out while they're seedlings and you'll avoid having those big mats of soil-hogging grasses later.

Small green plant

This is a bindweed seedling. Don't let it get much
bigger. (Photo by Jack Kelly Clark, courtesy UCIPM)

5) Field bindweed ( Convolvulus arvensis ). This terrible stuff never goes away: The rhizomes overwinter, then sprout as the weather warms. It also sprouts from seeds that can survive decades. Catch it early, before its white flowers appear (usually in April and later) and spread more seeds.

Of course, there are many, many more. To identify a weed, check the UC IPM Weed Gallery . Just don't let the (ahem) grass grow under your feet before getting those weeds gone.





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Garden Checklist for week of Feb. 16

Take advantage of this nice weather. There’s plenty to do as your garden starts to switch into high gear for spring growth.

* This is the last chance to spray fruit trees before their buds open. Treat peach and nectarine trees with copper-based fungicide. Spray apricot trees at bud swell to prevent brown rot. Apply horticultural oil to control scale, mites and aphids on fruit trees.

* Check soil moisture before resuming irrigation. Most likely, your soil is still pretty damp.

* Feed spring-blooming shrubs and fall-planted perennials with slow-release fertilizer. Feed mature trees and shrubs after spring growth starts.

* Transplant or direct-seed several flowers, including snapdragon, candytuft, lilies, astilbe, larkspur, Shasta and painted daisies, stocks, bleeding heart and coral bells.

* In the vegetable garden, plant Jerusalem artichoke tubers, and strawberry and rhubarb roots.

* Transplant cabbage and its close cousins – broccoli, kale and cauliflower – as well as lettuce (both loose leaf and head).

* Indoors, start peppers, tomatoes and eggplant from seed.

* Plant artichokes, asparagus and horseradish from root divisions.

* Plant potatoes from tubers and onions from sets (small bulbs). The onions will sprout quickly and can be used as green onions in March.

* From seed, plant beets, chard, lettuce, mustard, peas, radishes and turnips.

* Annuals are showing up in nurseries, but wait until the weather warms up a bit before planting. Instead, set out flowering perennials such as columbine and delphinium.

* Plant summer-flowering bulbs including cannas, calla lilies and gladiolus.

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