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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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Dig In: Garden checklist for week of Sept. 25

This week's warm break will revive summer crops such as peppers and tomatoes that may still be trying to produce fruit. Pumpkins and winter squash will add weight rapidly.

Be on the lookout for powdery mildew and other fungal diseases that may be enjoying this combination of warm air and moist soil.

* Late September is ideal for sowing a new lawn or re-seeding bare spots.

* Compost annuals and vegetable crops that have finished producing.

* Cultivate and add compost to the soil to replenish its nutrients for fall and winter vegetables and flowers.

* Plant for fall now. The warm soil will get cool-season veggies and flowers off to a fast start.

* Plant onions, lettuce, peas, radishes, turnips, beets, carrots, bok choy, spinach and potatoes directly into the vegetable beds.

* Transplant lettuce, cabbage, broccoli, kale, Brussels sprouts and cauliflower.

* Sow seeds of California poppies, clarkia and African daisies.

* Transplant cool-weather annuals such as pansies, violas, fairy primroses, calendulas, stocks and snapdragons.

* Divide and replant bulbs, rhizomes and perennials.

* Dig up and divide daylilies as they complete their bloom cycle.

* Divide and transplant peonies that have become overcrowded. Replant with "eyes" about an inch below the soil surface.

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