# coastal bush lupine (*Lupinus arboreus*) The coastal bush lupine is a bright and cheerful plant that grows along the coast. It has beautiful purple flowers that attract butterflies and bees, making it a favorite in gardens and nature. - **Category:** [Plants](https://www.snappit.app/explore/categories/plant) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 2 - **Habitat:** Coastal areas ![coastal bush lupine](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Lupinus_arboreus_%286062146673%29.jpg&width=800) Photo: Alex Lomas, CC BY 2.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Lupinus_arboreus_%286062146673%29.jpg) ## Appearance The coastal bush lupine is a robust, bushy shrub, often forming dense mounds. It has soft, silvery-green palmate leaves and produces upright spikes of fragrant, pea-like flowers, typically bright yellow but occasionally blue or purple. ## Taxonomy - **Kingdom:** Plantae - **Phylum:** Tracheophyta - **Class:** Magnoliopsida - **Order:** Fabales - **Family:** Fabaceae - **Genus:** Lupinus ## Interesting facts - It can grow so fast it sometimes forms "lupine forests" along the coast! - Its beautiful leaves taste bitter to most animals, acting as a natural defense! - Its seeds can stay dormant for decades, waiting for the perfect time to sprout! - This plant is a natural pioneer, creating fertile ground for other plants to grow! ## Special abilities - **Sand Stabilizer:** Coastal bush lupine has extensive root systems that weave through loose sand, anchoring it and preventing erosion along the coast. - **Salt & Drought Warrior:** Coastal bush lupine has silvery, hairy leaves and deep roots, helping it endure salty winds and conserve water in dry coastal zones. ## Measurements & details - **Height:** 100-200 cm - **Spread:** 100-200 cm - **Flower Size:** 1-2 cm - **Bloom Season:** Spring to early summer - **Edible:** No - **Toxicity:** Mild - **Lifecycle:** Perennial - **Pollination Method:** Insect ## Ecological connections - **Symbiotic with:** Rhizobium bacteria (*Rhizobium leguminosarum*) — fixes nitrogen in its roots - **Pollinates:** European honey bee (*Apis mellifera*) — visits flowers for nectar - **Pollinates:** Yellow-faced bumblebee (*Bombus vosnesenskii*) — gathers nectar and pollen - **Eats:** Genista Broom Moth (*Uresiphita reversalis*) — larvae feed on leaves ## Traits - [Flowering](https://www.snappit.app/explore/traits/flowering): Flowering plants are any plants that produce flowers as part of their reproductive cycle. - [Nitrogen Fixing](https://www.snappit.app/explore/traits/nitrogen-fixing): Describes organisms capable of converting atmospheric nitrogen into compounds usable by plants. - [Shrub](https://www.snappit.app/explore/traits/shrub): A shrub is a woody plant smaller than a tree, typically with multiple stems branching from or near the ground. - [Evergreen](https://www.snappit.app/explore/traits/evergreen): Evergreen plants retain their foliage throughout the year, never shedding all their leaves at once. - [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors. - [Pollinator Magnet](https://www.snappit.app/explore/traits/pollinator-magnet): Describes plants that are particularly attractive and beneficial to a wide range of pollinating organisms. - [Coastal](https://www.snappit.app/explore/traits/coastal): Coastal habitats are dynamic environments located along the interface between land and sea, influenced by tides, waves, and saltwater. ## Collections - [Plants](https://www.snappit.app/explore/collections/plants) ## Safety **Danger:** 1/5 · Very low Always look but don’t touch plants without asking an adult first. ## Frequently Asked Questions ### How to identify coastal bush lupine? Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details. ### How tall is coastal bush lupine? 100-200 cm ### How wide does coastal bush lupine spread? 100-200 cm ### How big are the flowers on coastal bush lupine? 1-2 cm ### When does coastal bush lupine bloom? Spring to early summer ### Is coastal bush lupine edible? No ### Is coastal bush lupine toxic? Mild ### What is coastal bush lupine's lifecycle? Perennial ## Where to spot - [Forts Baker, Barry, and Cronkhite](https://www.snappit.app/guides/places/forts-baker-barry-and-cronkhite) — California, US · Historic District - [Elkhorn Slough National Estuarine Research Reserve](https://www.snappit.app/guides/places/elkhorn-slough-national-estuarine-research-reserve) — California, US · Nature Reserve - [Palace of Fine Arts](https://www.snappit.app/guides/places/palace-of-fine-arts) — California, US · Historic District - [Point Reyes National Seashore](https://www.snappit.app/guides/places/point-reyes-national-seashore) — California, US · National Park - [Sunset State Beach](https://www.snappit.app/guides/places/sunset-state-beach) — California, US · State Park - [Lands End](https://www.snappit.app/guides/places/lands-end) — California, US · Natural Landmark [View all places to see coastal bush lupine](https://www.snappit.app/guides/where-to-see/coastal-bush-lupine) ## More Plants - [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*) - [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*) - [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*) - [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*) --- Source: [Coastal Bush Lupine: Facts & Places to See — Snappit](https://www.snappit.app/explore/coastal-bush-lupine)