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Weed Control

Weed Control

Our weed control services cover residential, commercial, agricultural lands and environmentally sensitive lands. Our primary plant targets are invasive and noxious weeds but we also control undesirable, but noninvasive plants growing in landscapes and lawns.

Some weeds we spend our time controlling are: non-native blackberry, English ivy, knotweeds, Scotch broom, tansy, thistle, yellow archangel, thistles, reed canary grass, yellow flag iris and foxtails. We treat and control all Class A, B and C noxious weeds as defined by Washington State Noxious Weed Control Board.

If you've discovered noxious weeds on your property, we can help figure out what species you have and whether their control is required or recommended. Peninsula Horticulture will work with you to understand what best management practices will work best for you. 

Generally, weeds come in these forms.

  • Grassy Weeds: These weeds thrive under the same conditions as your lawn’s grass. They include weeds like crabgrass, goose grass, and yellow foxtail. 
  • Broadleaf Weeds: Broadleaf weeds are easier to treat, have wider leaves, and often flower. They include thistles, dandelions, wild violets, and clovers. 
  • Warm-Season Weeds: These weeds thrive during warm summer months. 
  • Cool-Season Weeds: Cool-season weeds are most widespread in the spring and fall. 
  • Annual Weeds: Annual weeds die off naturally at the end of their yearly growing cycle, but can sprout 4-5 times before that happens.
  • Perennial Weeds: These pesky weeds come back year after year until treated or removed.

Pre-emergent Weed Control

Pre-Emergent Weed Control Services When it comes to invasive plant life, it’s always better to stop weeds before they sprout rather than waiting until after they’ve sprouted and had a chance to set roots and grow stronger. With pre-emergent weed control services from Peninsula Horticulture, your yard will be protected against a wide range of weeds year round. This type of service involves routine preventative treatments. These treatments keep grass healthy by protecting it against invasive broadleaf weeds. As noted above, with this approach you stop weed growth before seeds have the chance to take root and grow.

Post-emergent Weed Control

Post-emergent weed control is more difficult than pre-emergent, but in wildland areas, post-emergent weed control is our only real option. Post-emergent herbicides are designed to attack weeds that are already established and growing. All of the contact weed killers are post-emergents. Apply post-emergents later in the growing season, after weeds are established but before they have gone to seed.

Types of Post-Emergent Weed Killers Post-emergent formulas come as either systemic or contact applications.

  • Systemics are most useful on perennial weeds because they are absorbed directly into the plant and move throughout it for maximum killing action.

  • Contact herbicides kill the exposed part of the plant and are used on annuals and smaller weeds. This may seem to be insignificant, but in the majority of weeds, the death of the foliage is enough to kill the entire plant. 

Post-emergent herbicides also are classified as selective and non-selective.

  • Selective herbicides are used to target certain weeds, and in areas such as turf where contact with the grass is unavoidable.
  • Non-selective herbicides are used for broad weed control and have a purpose in open, unmanaged fields, for instance.

Timing of pre- and post-emergent herbicide application is critical

For both pre- and post-emergent herbicides, timing is critical. While post-emergent herbicides kill weeds at any point in the growth cycle, you’ll have the best success spraying young, actively growing weeds. Mature weeds may require repeated applications for total kill. Peninsula Horticulture employs both pre- and post-emergent weed management. 

With pre-emergent herbicides, you’ll want to apply the chemical prior to the time weed seeds start germinating. If you apply too early, these herbicides will have degraded and are useless when seeds start to germinate. Most pre-emergent crabgrass killers remain active in soil for six to eight weeks.

Weed seed germination occurs when soil reaches the correct temperature. The best way to determine the ideal time to apply pre-emergents is to contact your local extension agent or master gardeners, who have access to regional soil temperature data.

Other ways to gauge application time include using bioindicators, such as plants whose growth signals the correct time for application. For instance, in northern climates, spring crabgrass applications are often timed when forsythia is blooming, which frequently (but not always) occurs when soil temperatures are in the 50° F range. Another option is to time applications based on the calendar. For example, if you typically apply a pre-emergent herbicide in mid-April with success, then continue that routine.

Of course, you can avoid the issue of proper application timing altogether by purchasing a weed control product that combines both pre- and post-emergent herbicides. This type of product kills existing broadleaf weeds and keeps them from returning for as long as six months.