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California Honeysuckle

Lonicera involucrata

Last reviewed: September 2026

Lonicera involucrata is a deciduous shrub with yellow tubular flowers from May through August, followed by black paired berries. It grows well in moist mountain and streamside sites across the western United States.

California Honeysuckle (Lonicera involucrata)
Photo: (c) Laura Gaudette, some rights reserved (CC BY)

California Honeysuckle (Lonicera involucrata) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

The USDA PLANTS Database (opens in new tab) does not flag California Honeysuckle as toxic to livestock.

Light

part sun

Water

medium

Size

36"–120" H × 36"–120" W

Bloom

May, Jun, Jul, Aug

Native to

AZ, CA, CO, ID and 9 more states

Pollinators

hummingbirds, bees, butterflies

Before you buy

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Honeysuckle is an attractive native shrub with bright yellow flowers nestled in distinctive purple-red bracts. It grows as a medium-sized woody shrub, providing several months of flowering followed by showy black berries. This adaptable plant thrives in partly shaded areas with medium moisture.

Growing California Honeysuckle

Grow California Honeysuckle in part sun and medium water. Mature plants reach 36 to 120 inches tall and spread 36 to 120 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.

How to care for California Honeysuckle, by region

How to care for California Honeysuckle where it is actually grown: year-round basics plus what to do each season, region by region, with the sources for each.

Care guidance last updated: July 2026

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Southern California/Northern Baja Coast (includes Los Angeles, CA)

Year-round

Twinberry honeysuckle is a big, moisture-loving native shrub for the coolest, shadiest, dampest corner of a Los Angeles yard, not a drought bed.

  • Site it in the moistest, shadiest corner you have, part shade is ideal
  • Give it more water than your other natives, it is a riparian plant and does not go summer-dormant
  • Expect a large informal shrub up to about 10 ft that suckers and spreads, give it room
  • Let birds have the dark twin berries, they are for wildlife and not for people
  • Feed nectar to hummingbirds and bees with its tubular yellow flowers

To read as intentional and avoid a violation letter, plant this big suckering shrub toward the back of the yard as a green backdrop and prune it to a defined shape once a year rather than letting it sprawl over a path or property line.

Fall

Fall, after the first rains, is the prime window to plant or transplant this shrub so roots settle over the cool wet winter.

  • Plant now in the dampest, shadiest spot once the first rains arrive
  • Water a new planting in well and keep it moist while roots take hold
  • Add a thick mulch ring, keeping it a few inches off the stems
  • Cut back any dead or crossing stems as growth slows
  • Leave spent flowers and any late berries for the birds

When you plant, place it toward the back of the bed so the eventual large informal shrub reads as an intentional green backdrop rather than an overgrown front-yard surprise.

Winter

Winter is the cool wet growing season and the right time to shape this deciduous shrub while it is bare.

  • Let winter rain do most of the watering, only add water in a long dry spell
  • Prune while it is leafless to control size and shape and to thin crowded stems
  • Cut back suckers that are wandering past where you want the shrub
  • Refresh mulch to protect roots through the cool months
  • Rare coastal frost usually does no harm, no winter cover needed

A dormant-season cutback to a clean defined shape keeps this suckering shrub looking cared for and intentional, which is what keeps it HOA-friendly at the edge of a front yard.

Spring

Spring is peak leaf-out and the start of bloom, so keep the soil damp and let it grow.

  • Keep the root zone evenly moist as the last winter rains taper off
  • Watch for the first tubular yellow flowers, bloom runs into summer
  • Add a few inches of mulch out to the drip line to hold moisture and keep roots cool
  • Pull weeds around the base by hand so the shrub is not competing for water
  • Skip heavy pruning now, save shaping for the dormant season

Summer

Unlike the drought natives around it, this one wants steady summer water through the hot dry Los Angeles months.

  • Water deeply and regularly all summer, do not let it dry out and go crispy
  • Check the soil a few inches down, if it is dry give it a slow deep soak
  • Keep mulch topped up to slow evaporation during the bone-dry season
  • Enjoy the twin dark berries as bird food, leave them for wildlife
  • Give afternoon shade if you can, the coastal marine layer helps early summer but inland heat can scorch it

Sources: Calscape (California Native Plant Society), Lonicera involucrata, native range and moist/riparian habitat, USDA PLANTS Database, Lonicera involucrata (LOIN5), lists no toxicity to livestock or horses

Want these tasks as reminders timed to your yard? Pollinator Patch turns this guidance into a season-by-season care plan for the plants you actually grow.

In an HOA neighborhood

California Honeysuckle is an HOA-friendly choice. Maintenance level: moderate. Tidiness: 3 out of 5.

Works well in: foundation, mid zone.

  • Can appear somewhat informal/wild if not occasionally pruned
  • Deciduous nature means seasonal bare branches
  • May spread beyond intended boundaries without management

Wildlife value

This honeysuckle provides excellent habitat and food for wildlife. The tubular flowers attract hummingbirds, while bees and butterflies visit for nectar, and birds feed on the dark berries that follow.

Common questions

When does Lonicera involucrata bloom?
This shrub typically flowers from May through August, with small yellow tubular blossoms appearing in pairs along the stems.
What pollinators visit this shrub?
Hummingbirds, bees, and butterflies are drawn to the tubular yellow flowers of Lonicera involucrata throughout its summer bloom period.
How much water does this shrub need?
It grows best with medium to consistently moist soil and is often found near streambanks, seeps, and other damp mountain habitats.
How much sun does Lonicera involucrata need?
It performs well in part sun but can also handle brighter, full sun spots or somewhat shadier part shade locations, especially where soil moisture is adequate.
What does the shrub look like outside of bloom season?
Lonicera involucrata is a deciduous shrub with an upright, arching form, and it produces small black berries backed by reddish bracts after flowering.
Is California Honeysuckle toxic to dogs?
California Honeysuckle is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
Is California Honeysuckle toxic to cats?
California Honeysuckle is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
Is California Honeysuckle toxic to livestock?
The USDA PLANTS Database does not flag California Honeysuckle as toxic to livestock.
Is California Honeysuckle HOA-friendly?
California Honeysuckle is generally an HOA-friendly choice in the right placement, with moderate maintenance.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

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