PlantsArtichokes→Globe Artichoke (Cynara scolymus 'Imperial Star')

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Mesic
Minimum cold hardiness: Zone 7a -17.8 °C (0 °F) to -15 °C (5 °F)
Maximum recommended zone: Zone 10b
Plant Height: 3-4 feet
Plant Spread: 3- 4 feet
Fruit: Other: Flower buds are edible; flowers are not.
Flowers: Showy
Flower Color: Purple
Flower Time: Summer
Uses: Vegetable
Edible Parts: Fruit
Wildlife Attractant: Bees
Resistances: Salt tolerant
Propagation: Seeds: Provide darkness
Needs specific temperature: 70 to 80 degrees
Days to germinate: 4 days up to 3 weeks, depending on soil temp
Depth to plant seed: 1/4"
Start indoors
Can handle transplanting
Other info: Move seedlings to 4" pots after true leaves appear. See note below regarding vernalization.
Propagation: Other methods: Offsets
Pollinators: Moths and Butterflies
Bees
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots

Image

Photo gallery:
Location: Riverside, CADate: 2014-05-11
By JulieB
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Location: My Garden in Janesville, WIDate: 2015-07-20
By tveguy3
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Date: 2011-02-18Imperial Star artichoke seedlings showing cotyledons (rounded lea
By Horseshoe
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Location: MoonDance Farm, NCDate: 2011-06-12Young bud of Imperial Star artichoke
By Horseshoe
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 Courtesy Seeds of Victoria
By vic
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Location: My Garden in Janesville, WIDate: 2015-07-11
By tveguy3
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Location: My Garden in Janesville, WIDate: 2015-07-20
By tveguy3
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Courtesy Sustainable Seed Company
By vic
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Comments:
Posted by Horseshoe (Efland, NC - Zone 7a) on Feb 19, 2012 10:35 AM

Imperial Star artichoke will produce flower buds the first year if given 250 hours of cold treatment, a.k.a. "vernalization".

This is done by starting your seeds early enough to allow seedlings exposure to temperatures below 50ºF. Although daytime temps may be in the higher range (60-70º F) if night time temperatures drop to 50º or below vernalization will still take place. Keep in mind, freezing temperatures and/or frost is detrimental to seedlings; protect from either.

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