Botanical Garden




Дата канвертавання26.04.2016
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Draft August 19, 2009_V2, jacquelinesarratt@yahoo.com

Bike Path Slope and Bioswale “Botanical Garden” Design

As requested by the biology department, the majority of the design will emphasize clustered California plant communities. Plants should be arranged in separate sections (see below) and planted in multiples as they would be seen in nature.

Within the overall Mediterranean theme, there are two areas that have been proposed for natives: the large newly constructed slope along the bike path (“the slope”), and the area NE of the greenhouse (“Maritime Chaparral”).



8 CA Plant Community Sections (suggested communities - feel free to edit!)


  1. Channel Islands

  2. Dune/Coastal Strand

  3. Coastal Prarie/Grassland

  4. Coastal Sage Scrub

  5. Mixed Evergreen Forest

  6. Closed-cone Pine Forest

  7. Riparian

  8. Maritime Chaparral

Summary of Phase 1 (fall 2009): Decide placement of beds, grade soil, manage weeds. Stabilize the slope with bunchgrass and wildflower seeds, and when possible, plant multiples of the species common to several communities (“dominant” plants).

Summary of Phase 2: After the immediate erosion issues are addressed, specimen plants from the greenhouse could be added, as well as benches and permanent signs to describe the plant communities. Community boundaries are meant to be flexible as we better understand the landscape over time.

Suggested dominant plants to be purchased by grounds in multiple:

Achillea millefolium

Artemisia californica

Artemisia pycnocephala

Coreopsis gigantea

Calamagrostis nutkaensis

Dendromecon harfordii

Erigeron glaucus

Eriogonum arborescens

Eriogonum latifolium grande var. rubescens

Eriogonum parvifolium

Eriophyllum stacheadifolium

Erysimum franciscanum var. crassifolium

Festuca rubra

Fragaria chiloensis

Gaultheria shallon

Heteromeles arbutifolia

Iris douglasiana

Juncus patens

Polystichum munitum

Mimulus aurantiacus

Rhamnus californica

Ribes sanguineum

Rosa californica

Sedum spathufolium

Sisyrinchium bellum

Site Description and Seeding Plan

The soil is imported by the construction company, and is currently exposed, poor, and sandy. The area has southwest exposure and is mostly in part or full shade, with a small strip (~15’ wide?) adjacent to the path appearing to get midday sun for up to a few hours. To help stabilize the bare soil, the area will be seeded with a mix of native bunch grasses to be spread and raked in when the rains start (~Nov). (Hopefully the soil isn’t full of weed seeds, but even if they come up their roots help to stabilize the soil...perhaps we could wait to pull them ~flowering time, before they go to seed?) To increase the value to wildlife, we could add locally native wildflower seeds; the following are doing well outside Thornton: Clarkia unguiculata, coastal CA poppy, Chinese houses, tidytips, phlox, farewell-to-spring. The greenhouse can supply specimens of Festuca californica and Kohleria macranth, other suggested species are: Nassella cernua, N. lepida, or N. pulchra, Deschampsia caespitosa, Leymus condensatu Canyon Prince”, Danthonia californica, Carex praegracilis, Carex barbarae, Muhlenbergia rigens (needs sun). We should try a few packets (~$5 each) of perennial seeds from Larner: i.e. Plantago subnuda, Eriogonum latifolium grande var. rubescens, Eriophyllum confertiflorum.

It’s likely that that people wanting to walk from the mall to the parking garage will cut through the corner - to prevent erosion this would be a good place to have a small path down the slope. The concrete wall could be painted with a mural and/or planted with Clematis and Aristolochia (may need attachment).

Plant Community Sections:

Each section would represent a plant community that is appropriate for the exposure and drainage of that site. This area will need occasional hand weeding during the first few years, but hopefully we can irrigate as little as possible. Names in bold are suggested dominant plants.

The first four communities are in the sun adjacent to the bike path, starting at the top. (Do we need garbage/recycling/map here? Maybe a do not disturb the neighbors sign?) This area of the slope gets the most sun as well as good drainage.

Channel Islands

Coreopsis gigantea

Dendromecon harfordii

Eriogonum arborescens

Paeonia californica (greenhouse)

Rosa californica

Ribes speciosum

Heteromeles arbutifolia

Eriogonum latifolium grande var. rubescens (Annie’s, Larner)

Dune/Coastal Strand - further down the bike path the plants could transition to following mainland coastal plants:

Artemisia pycnocephala

Baccharis pilularis pilularis Pigeon Point - 1 individual

Camissonia cheiranthifolia (ssp. suffruticosa locally native at Annies)

Carex praegracilis

Ceanothus gloriosus gloriosus Pt. Reyes Ceanothus

Erigeron glaucus

Fragaria chiloensis

Lotus scoparius

Plantago subnuda - coastal plantain (by seed from Larner; hostplant for threatened Bay checkerspot butterfly)

Coastal Prarie/ Grassland

Achillea millefolium

Carex praegracilis

Eriogonum parvifolium

Festuca rubra

Fragaria chiloensis

Iris douglasiana

Sisyrinchium bellum

Erigeron glaucus

Plantago subnuda

Other assorted bunchgrasses...



Coastal Sage Scrub - the last of the sunny sections.

Artemisia californica

Baccharis pilularis - 1 individual

Ceanothus thyrsiflorus - 1 individual - plant is up to 25’x25’.

Chlorogalum pomeridianum (greenhouse)

Eriophyllum stacheadifolium

Eriogonum parvifolium

Erysimum franciscanum var. crassifolium

Fragaria chiloensis

Grindelia stricta var. stricta (could propagate from greenhouse; Also at Annie’s)

Heteromeles arbutifolia

Mimulus aurantiacus

Lupinus spp.

Plantago subnuda

Rhamnus californica

Sedum spathufolium

Scrophularia californica

The rest of the area is in either full or part shade from the eucalyptus (there is also one coast live oak and an acacia), and could contain the following:



Mixed Evergreen Forest

Artemisia douglasii

Berberis spp.

Gaultheria shallon

Holodiscus discolor

Rhamnus californica

Ribes sanguineum

Mimulus aurantiacus

Polypodium californicum

Polystichum munitum

Scrophularia californica

Sisyrinchium californicum

Vaccinium ovatum (greenhouse)

Closed-cone Pine Forest?

Calamagrostis nutkaensis (Annie’s)

Gaultheria shallon

Mimulus aurantiacus

Myrica californica

Riparian This is the “bioswale” - full shade, seasonally moist, with occasional flooding, but these plants are drought tolerant once established.

Aristolochia californica (greenhouse)

Lonicera involucrata

Salix spp. (greenhouse; donated by Connor lab)

Juncus patens

Mimulus guttatus

Sisyrinchium californicum

Plantago subnuda

On the northeast side of the greenhouse there is an area which receives full sun and contains a south-facing slope as well as a flat section where we could have:



Maritime Chaparral

Adenostoma fasciculatum

Arctostaphylos spp. A. andersonii, A. crustacea, A. montereyensis, A. hookeri, A. pumila, *A. silvicola, other maritime spp. (supplied by greenhouse or Parker lab?)

Artemisia californica

Ceanothus cuneatus, C. papillosus, C. thrysiflorus

Eriogonum fasciculatum

Eriophyllum confertiflorum (Larner?)

Heteromeles arbutifolia

Galvezia speciosa (greenhouse)

Rhamnus californica

Quercus spp. (scrub oaks from the greenhouse)

Ribes speciosum

Romneya coulteri (greenhouse)

Salvia apiana


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