How to Grow Lupine
Lupine At a Glance
Difficulty
Moderate
Category
Flower
Sun Exposure
Full Sun, Partial Sun
Frost Tolerance
Frost Hardy
Cold Hardiness
Survives to -34°C
Plant Family
Fabaceae
Growing Season
Cool Season
Plant Lifecycle
Perennial
How to Start It
★ Recommended for beginners
Lupines sprout better after cold, so sow them in late fall and winter does the work, or about 4 weeks before your last spring frost. Rub the hard seeds lightly on sandpaper or soak them overnight in warm water, then sow 2 seeds 0.5 cm deep every 30 cm. They sprout in 10 to 14 days. Sow them where they will grow, since lupines grow one long main root that hates being moved.
Lupines usually flower from their second year and live only a few years, so let some drop seed or sow a few each year to keep them going. Like peas, their roots add nitrogen (a plant food) to the soil.
When To Start
First chance to plant
30 Days Before Last Frost
Last chance to plant
60 Days Before First Frost
When should you plant Lupine?
Your planting dates depend on your local climate. Sign up and add your location to unlock personalized dates.
Your Lupine Planting Window
Start planting
May 15, 2026
Last chance
Sep 10, 2026
Your Lupine Calendar
Set your location to turn these into exact dates and reminders.
Soak lupine seeds and sow them outdoors where they will grow
30 days before your last frost· every year
Cut faded lupine spikes for a second round of flowers
60 days after your last frost· every year· optional
Did you water your lupine seedlings today? Keep the top of the soil damp until they are up and growing.
About 1 days after you plant it
Your lupines are on their way! Water deeply now and then rather than a little every day.
About 44 days after you plant it
Nice progress! Keep weeds away so your lupines have room to grow strong.
About 74 days after you plant it
Picking time may be here: check your lupine.
About 90 days after you plant it
The Journey Ahead
Lupine's Lifecycle
Seedling
Mature Plant
Seed Production
Step 1
Prepare Your Space
0.5 cm
Seeding Depth
30 cm
Plant Spacing
60 cm
Row Spacing
1
Plants / Sq Ft
Vertical Growing
No.
Method: None
Succession Planting
No.
Good Companions
Bad Companions
Step 2
Planting & Sprouting
Expect sprouts in 10–14 days
Growing Tips
- 1Grow lupines in full sun or light afternoon shade.
- 2They like well drained, slightly acidic soil and need only a little compost, since rich soil gives soft, floppy growth.
- 3Water regularly in their first year and in dry spells, but never let the roots sit in soggy soil.
- 4Skip extra feeding, as lupines make much of their own plant food.
- 5Cut faded flower spikes down to the leaves, and a smaller second round of flowers often follows.
- 6Spray aphids off the flower spikes with water, and keep children and pets away from the plants, since the seeds and leaves are poisonous if eaten.
Seedling Phase
Step 3
Growth & Maturity
~90
Days to Maturity
90 cm
Mature Height
60 cm
Mature Width
Pests to Watch For
Diseases to Watch For
Mature Plant
Step 4
Harvesting
Harvest Window
45 days
When to Pick
Cut flowers at peak bloom
How to Harvest
- 1For a vase, cut spikes when the lower half of the flowers are open and the top is still in bud.
- 2Cut early in the morning and put the stems in water right away.
- 3Snip off faded spikes before they form pods, unless you want seeds, so the plant puts its energy into new flowers.
- 4In fall, cut the leaves and stems back to the ground once they turn yellow.
Step 5
Saving Seeds
How to Save Seeds
Bees carry pollen between lupines, so seedlings from mixed colours or named varieties may look different, and hybrid F1 seeds will not grow true. Leave a few spikes until the pods turn brown and dry. The pods twist open and fling their seeds, so slip a paper bag over the spike and tie it once the pods start to brown. Shell the seeds, dry them on a plate for a week, and store them labelled in a cool, dark, dry place, where they keep several years. Lupine seeds are poisonous, so keep them away from children and pets.
Seed Production
Still have a question?
Ask your coach about your lupine.
This page covers what we thought to write down. Your lupine will do something it never mentions, and that is the day a coach beats a guide. Ask Coach Lumen one question right now, free, no account.
