River Lupine
Also known as: Lupinus rivularis · Riverbank Lupine · Stream Lupine · Streambank Lupine
Poisonous — do not eat
What's special about River Lupine
Streamside northwestern native lupine.
Growing this variety
River Lupine follows the same growing basics as Lupine. Variety-specific maturity above; everything else below applies to the whole Lupine family.
Germination
Spacing & depth
How to plant
Nick or soak seed 24 hours to break dormancy. Sows best where it will grow — long taproot resents transplant. Fixes its own nitrogen; do not overfeed.
Pre-sow treatment
Nick seed coat or soak in warm water 24 hours before sowing.
Grower's tip
Tall spires in blue, purple, pink, yellow, white. Deadhead for a second flush. Seeds and plant are toxic to livestock.
Good to know before you grow this
Parts of this plant are toxic to people and pets — don't eat it and keep it away from children and animals.
Soil preferences
Well-drained garden soil. Native/wildflower species prefer lean soil; cutting flowers prefer richer beds.
6.0–7.0
Work 1 in of compost into beds before sowing. Skip nitrogen fertilizer on wildflowers — it favors foliage over blooms.
Watering
1 in per week during establishment, drought-tolerant once rooted for most species.
Deep, infrequent soakings at the base. Overhead water on ornamentals promotes botrytis and rust.
Overwatered: rotted crowns, mildew, floppy stems. Underwatered: small blooms, curled leaves, quick fade.
Prefers top-watering — Trees are always top-watered — deep slow soak at the drip line, never at the trunk. Bottom-watering only makes sense for nursery seedlings.
Temperature tolerance
60–80°F (16–27°C) ideal for most annuals
50–65°F (10–18°C)
Cool-season annuals (larkspur, poppy, snapdragon) tolerate light frost; warm-season annuals (zinnia, cosmos, marigold) are frost-tender.
Container growing
Possible with the right cultivar
8–14 in (20–35 cm) wide
Compact and dwarf types do best in pots; tall cutting flowers need staking.
Detailed harvesting
Nothing here is harvested for the kitchen. Wear gloves for any cutting or deadheading, keep the sap off your skin and eyes, and wash your hands and tools afterwards.
Post-harvest storage & preservation
Do not dry, store or preserve any part of this plant near food. Bag prunings for the bin — never compost them where animals browse, and never burn them.
Culinary, medicinal & other uses
Ornamental only — this plant is poisonous and has no food, tea or home-remedy use. Grow it for looks, wear gloves, and keep it away from children, pets and livestock.
Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.
Seed saving
Mostly insect-pollinated (outcrossing).
For pure strains, isolate 150–800 ft or bag heads. Wildflower mixes are meant to cross freely.
Stop deadheading favorite blooms; let heads dry brown and rattling on the stem, then collect into a paper bag.
Your zone's planting calendar
Pick your USDA hardiness zone and we'll estimate the key dates for lupine in your area. These are regional averages — always check your own last-frost forecast before sowing.
My River Lupine Lupine notes
River Lupine Lupine seeds on hand
Track packets and loose seeds you already have. Private to your account.
Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.
Order more seeds
Running low? Reorder from one of these seed stores.
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Other Lupine varieties
Sickle Keeled Lupine
Native western lupine — sickle-shaped seedpods.
Bicolor Lupine
Small annual native lupine — companion to California poppy.
Sundial Lupine
Native eastern lupine — sole larval host for endangered Karner blue butterfly.
Bigleaf Lupine
Tall native western lupine — parent of showy Russell hybrids.
Texas Bluebonnet
Texas state flower — carpets of vivid blue in spring.