The illustrated growing guide
Cup Plant
Silphium perfoliatum
Family Asteraceae
Est. zones 3-9
A native prairie titan that feeds and waters wildlife literally — its fused leaves form cups that catch rain for birds and bees to drink and bathe in, while goldfinches mob the seed heads and pollinators cover the yellow sunflower blooms. Tall and dramatic (6-8 ft), it anchors the back of a big meadow planting. Pure ecological function with a bold presence.
Full Sun to Part Shade
Moderate water
Fast growth
Native to North America
Attracts bees
From the print shop
The closest print we make
We don’t print Silphium perfoliatum. The closest we have is Silphium laciniatum (“Compass Plant”) in the Prairie Flowers collection — the same genus, Silphium, not the same species.
16 designsfrom $21.99white or black groundmatte poster, unframed
I
Overview
Will cup plant 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 cup plant actually needs.
Hardy inZones 3-9Cup Plant at a glance
Common cup plant problems
- Almost none
- Almost none
II
Growing
Light, water, soil, propagation and the season’s jobs.
How to grow cup plant: light, water & soil
How to plant & propagate cup plant
III
The year
What cup plant asks for, month by month.
The cup plant year, month by month
BloomPruneWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Prune — shape it now — cuts heal cleanly and structure is visible.
The cup plant year as text
- Jan pruning
- Feb pruning
- Mar pruning
- Apr pruning
- May pruning
- Jun quiet month
- Jul bloom
- Aug quiet month
- Sep bloom
- Oct bloom
- Nov bloom
- Dec pruning
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.
Cup Plant in the garden system
- Herbaceous layer perennial
- Nectary/insectary
What cup plant is grown for
✓ Commonly eaten
Harvesting & storing cup plant
Seeds are premier goldfinch food.
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 cup plant, ruled as a catalogue.
Best cup plant varieties & cultivars
Species
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 cup plantyet. 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
Cup Plant questions, answered straight.
Is cup plant safe for kids and pets?
Cup Plant is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.
When do you harvest cup plant?
Seeds are premier goldfinch food.
How do you propagate cup plant?
Division or seed.
IX
Elsewhere
Where cup plant sits in the library.
Common Milkweed
Ironweed
Helen's Flower (Sneezeweed)
Turtlehead