The illustrated growing guide
Sweet Pea
Lathyrus odoratus
Family Fabaceae
Grown as an annual
The most fragrant thing a trellis can do. Soak seed, sow in late winter cold, and understand the contract: the more you cut for the house, the more it blooms.
Full Sun
Moderate water
Fast in cool weather growth
Attracts bees
None winter chill
From the print shop
Growing sweet pea? Hang it.
Our Garden Blooms collection carries sweet pea — Lathyrus odoratus, print Nº 8, “Sweet Pea.”
16 designsfrom $21.99white or black groundmatte poster, unframed
I
Overview
Will sweet pea suit your garden, and what goes wrong.
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what sweet pea actually needs.
Life cycleAnnualSweet Pea at a glance
Common sweet pea problems
II
Growing
Light, water, soil, propagation and the season’s jobs.
How to grow sweet pea: light, water & soil
How to plant & propagate sweet pea
III
The year
What sweet pea asks for, month by month.
The sweet pea year, month by month
BloomWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
The sweet pea year as text
- Jan quiet month
- Feb quiet month
- Mar quiet month
- Apr bloom
- May bloom
- Jun bloom
- Jul quiet month
- Aug quiet month
- Sep bloom
- Oct bloom
- Nov bloom
- Dec quiet month
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
IV
Ecology & uses
What it does for the garden, and what it is grown for.
Sweet Pea in the garden system
- Vine layer annual
- N-fixer
What sweet pea is grown for
! Some parts toxic — see notesSEEDS TOXIC — not an eating pea, keep from kids/pets
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
V
Cultivars
Named varieties of sweet pea, ruled as a catalogue.
Best sweet pea varieties & cultivars
'Cupani' (original, most fragrant); 'Spencer' types (ruffled show); 'Old Spice' (heat-tolerant)
VI
Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to sweet peayet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
VII
Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
VIII
Questions
Sweet Pea questions, answered straight.
Is sweet pea safe for kids and pets?
With care. SEEDS TOXIC — not an eating pea, keep from kids/pets Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
How do you propagate sweet pea?
From seed.
IX
Elsewhere
Where sweet pea sits in the library.
Morning Glory
Clematis
Wisteria
Coral Honeysuckle