Vegetation Management and Maintenance Plan - Watsonville ...

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3.1.9 Active Revegetation Within the VMMM project area, active revegetation is a suitable follow-up treatment for areas where infestations of thistles (Italian thistle, slender-flowered thistle, bull thistle), bristly oxtongue, poison hemlock, and French broom have been removed. Active revegetation is a critical requirement for eradication and/or long-term control of Harding/canary grass. In suitable areas, revegetation efforts can include broadcast seeding and direct plantings of plugs and other container stock. Revegetation efforts should utilize native plant species that are aggressive competitors with invasive species. Grass species, such as blue wild rye (Elymus glaucus) are recommended for many post-eradication areas. Other herbaceous and woody plant species are also recommended, as listed in Table 6 below. In areas immediately adjacent to a trail, where trail user visibility is a concern, low-growing shrubs and herbaceous plant species are recommended. If a dense cover of native plant species can be established, weed recruitment in these areas will be substantially reduced. Vegetated buffer zones can also be established using active revegetation. The VMMM identifies projects to establish low-growing evergreen buffer areas between residential yards, slough trails, and City open space areas. Evergreen buffer plantings will reduce weed infestations, reduce grass cover and fire hazards, and promote native plant habitat. Low-growing evergreen shrubs suitable for buffer plantings are listed in Table 6. Table 6. Plant Species Suitable for Revegetation within the VMMM Project Area Common Name Scientific Name Typical Plant Typical Propagule Size Spacing Vegetated Buffer Areas Dwarf Coyote Brush Baccharis pilularis pilularis 6 1 gallon or Dee pot ‘Pigeon Point’ Hooker’s Manzanita Arctostaphylos hookeri 6 1 gallon Dwarf Wild Lilac Ceanothus griseus 6 Dee pot horizontalis Coffee Berry Rhamnus californica 6 1 gallon or Dee pot Bee’s Bliss Sage Salvia ‘Bee’s Bliss’ 6 1 gallon or Dee pot Low-Growing Trail Edge Revegetation Spreading Rush Juncus patens 4 2-inch pot Common Yarrow Achillea millefolium 4 2-inch pot Wood Strawberry Fragaria vesca 4 2-inch pot Creeping Wildrye Leymus triticoides 2 2-inch pot or plugs Foothill Sedge Carex tumulicola 2 2-inch pot or plugs Blue-eyed Grass Sisyrinchium bellum 4 2-inch pot California Meadow Sedge Carex pansa 4 2-inch pot Creeping Sage Salvia somomensis 6 1 gallon or Dee pot Scrub Revegetation Areas Sticky Monkey Flower Mimulus aurantiacus 6 1 gallon California Rose Rosa californica 6 1 gallon or Dee pot Snowberry Symphoricarpos rivularis 6 Dee pot Mugwort Artemisia douglasiana 6 Dee pot Coyote Brush Baccharis pilularis 6 1 gallon or Dee pot California Blackberry Rubus ursinus 6 Dee pot California Aster Aster chilensis 6 Dee pot Deerweed Lotus scoparius 6 Dee pot California Sagebrush Artemisia californica 6 2-inch pot Vegetation Management and Maintenance Manual Draft 28 July 27, 2007
Table 6. Plant Species Suitable for Revegetation within the VMMM Project Area (continued) Common Name Scientific Name Typical Plant Typical Propagule Size Spacing Dwarf Coyote Brush Baccharis pilularis pilularis ‘Pigeon Point’ 6 1 gallon or Dee pot Hooker’s Manzanita Arctostaphylos hookeri 6 1 gallon Dwarf Wild Lilac Ceanothus griseus 6 Dee pot horizontalis Grassland Areas Blue Wildrye Elymus glaucus - Seed California Brome Bromus carinatus - Seed Red Fescue Festuca rubra - Seed 3.1.10 Passive Revegetation Within the VMMM project area, passive revegetation is a suitable treatment for expanding stands of coyote brush and other desirable native plants (e.g., California rose, blackberry, willow) that are vigorous and have the potential to spread into areas infested by invasive weeds. The VMMM project area supports areas of thistles, wild mustard, wild radish, bristly ox-tongue, poison hemlock, and Harding/canary grass that are growing amid and/or immediately adjacent to native vegetation. In these areas, selective removal/control of the invasive weeds (while retaining the surrounding or adjoining native vegetation) will allow the native plants to spread and outcompete the invasive weeds. Where invasive weeds abut stands of native shrubs, five-foot wide bands of invasive plant species growing outward from the native stand should be removed/treated (Bradley method). Areas may need to be treated more than once, at 2-3 year intervals. Where weeds grow amid the native shrubs, selective removal of the weeds should be done using hand labor such that there is minimal impact to the native shrubs to be retained. 3.2 PRIORITY TREATMENT AREAS Invasive weeds infestations within the VMMM project area have been prioritized for treatment. These areas have been designated as high, moderate, or low, based on the species occurrence in the project area, it’s ranking (based on the species ability to spread and its impact on habitat values), and treatment options. Figures 8, 9, and 10 depict these priority treatment areas. 3.2.1 High Priority Treatment Areas (Years 1-5) Areas identified as a high priority have been divided into the following seven categories and are depicted on Figures 8, 9, and 10: H.1 –Remove Isolated Patches of Highly Invasive Species: These species occur in low numbers and/or are confined to a few, scattered occurrences; they have ability to quickly spread into un-infested areas. Level of infestation is low enough that it is feasible to eradicate them from project area within five years. The species are not widespread in the project area yet have the potential to spread into non-infested areas within next 1-5 years. Species include yellow star thistle, French broom, pampas grass, Bermuda buttercup, and teasel. Vegetation Management and Maintenance Manual Draft 29 July 27, 2007
Page 1 and 2: Draft Watsonville Wetlands Trail Sy
Page 3 and 4: TABLE OF CONTENTS 1.0 INTRODUCTION
Page 5 and 6: CHAPTER 1.0 INTRODUCTION The Watson
Page 11 and 12: CHAPTER 2.0 INTRODUCTION TO WEEDS W
Page 13 and 14: assigned to each species. This rank
Page 18 and 19: CHAPTER 3.0 INVASIVE WEED MANAGEMEN
Page 20 and 21: General Rules for Grubbing • If t
Page 22 and 23: whipping is critical. However, loca
Page 24 and 25: applications will be needed to cont
Page 26 and 27: Table 4. Levels of Invasive Weed In
Page 34 and 35: In addition, isolated patches of wi
Page 36 and 37: Table 7. Invasive Weed Treatment -
Page 38 and 39: Table 7. Invasive Weed Treatment -
Page 43 and 44: CHAPTER 4.0 RIPARIAN AND WETLAND MI
Page 45 and 46: Table 11. Lower Struve Slough Mitig
Page 47 and 48: Each year’s annual monitoring rep
Page 49 and 50: APPENDIX A Invasive Weeds within th
Page 51 and 52: WILD MUSTARD Brassica ssp. DISTINCT
Page 53 and 54: BULL THISTLE Cirsium vulgare DISTIN
Page 55 and 56: FENNEL Foeniculum vulgare DISTINCTI
Page 57 and 58: HARDING GRASS Phalaris aquatica REE
Page 59 and 60: CURLY DOCK Rumex crispus DISTINCTIV
Page 61 and 62: APPENDIX B Native Plants within the
Page 63 and 64: CALIFORNIA BUCKEYE Aesculus califor
Page 65 and 66: BLACK COTTONWOOD Populus balsamifer
Page 67 and 68: MUGWORT Artemisia douglasiana DISTI
Page 69 and 70: CALIFORNIA BLACKBERRY Rubus ursinus
Page 71 and 72: COMMON RUSH Juncus patens BOG RUSH
Page 73 and 74: APPENDIX C Volunteer Projects Veget
Page 75 and 76: DESCRIPTION OF WORK VOLUNTEER PROJE
Page 81 and 82: APPENDIX D Mitigation Area Maps Veg
Page 83 and 84:
APPENDIX E Bucket Watering System V
Page 85:
Georges' Bucket Watering System For
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