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Local Significant Allergens for Ventura County, California in Fall

We consider Fall to be September, October and November.

The plants listed below have been documented to grow in your state, and to flower during the season indicated nationally. Flowering time pertains to the particular season of the year that a species is most likely to occur within your area. Although the flowering period for any particular species may be fairly extensive, the pollination period itself (which may cause allergic symptoms to those sensitive) is generally much more abbreviated.
Mild Allergen   Moderate Allergen   Severe Allergen  
Weeds

Biennial Wormwood (Artemisia biennis) Black Mustard (Brassica nigra) Bracted Saltbush (Atriplex serenana) Cattle-Spinach (Atriplex polycarpa) Coastal Sagebrush (Artemisia californica) Common Wormwood (Artemisia vulgaris) Coyotebrush (Baccharis pilularis) Deer-Root (Iva axillaris) Douglas' Wormwood (Artemisia douglasiana) Dragon Wormwood (Artemisia dracunculus) Five-Horn Smotherweed (Bassia hyssopifolia) Flat-Spine Burr-Ragweed (Ambrosia acanthicarpa) Four-Wing Saltbush (Atriplex canescens) Mat Amaranth (Amaranthus blitoides) Palmer's Amaranth (Amaranthus palmeri) Pennsylvania Pellitory (Parietaria pensylvanica) Perennial Ragweed (Ambrosia psilostachya) Quailbush (Atriplex lentiformis) Rape (Brassica rapa) Russian-Thistle (Salsola kali) Silver Burr-Ragweed (Ambrosia chamissonis) Silverscale (Atriplex argentea) Smooth Amaranth (Amaranthus hybridus) Tumbling Orache (Atriplex rosea) Weak-Leaf Burr-Ragweed (Ambrosia confertiflora)
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