Propagate by seed, division or separation - Seed may not breed true.

Germination temperature: 70 F to 80 F

Days to emergence: 8 to 12

Seed can be saved 6 years.

Plant root divisions (basal stem pieces with attached roots) after last frost, 2 to 3 feet apart in rows 2.5 to 3 feet apart.

Planting from seed not recommended because results are highly variable and usually inferior to parent plants. But if you do, start seeds about 8 to 12 weeks before last frost. Harden off in cold frame. Cold treatment of starts (keeping temperature between 35 F and 50 F for about 10 days) can induce flowering in first-year plants. Transplant outside after soil has reached 60 F.

Benefits from the use of a low-nitrogen fertilizer (high in phosphorus and potassium), which can be incorporated before planting.

Plants usually don’t flower the first year.

To increase chance of overwintering, head back to 12 inches and cover with leaves, covered with baskets or boxes, and heap more leaves over the top of the basket. Another alternative is to dig roots and store in a cold (but not freezing) room. Pot up about a month before transplanting out after last frost.

While individual plants may live up to 15 years or more, divide about every 3 years to keep planting productive.

Aphids - A hard stream of water can be used to remove aphids from plants. Wash off with water occasionally as needed early in the day. Check for evidence of natural enemies such as gray-brown or bloated parasitized aphids and the presence of alligator-like larvae of lady beetles and lacewings.

Browse globe artichoke varieties at our Vegetable Varieties for Gardeners website.

Green Globe and Green Globe Improved are standard commercial varieties grown in milder climates than those found in most of New York.

Shorter season varieties that are more likely to flower and winter over in New York include:

Imperial Star - grows just 3 feet tall
Violetto - purplish buds
Grande Buerre - spineless heads, grows up to 9 feet tall