Globe Artichoke Care: Space, Feeding and Keeping the Crown Productive

Give it more room than you think it needs

A mature globe artichoke is a shrub-sized plant. The silver leaves arch out three to four feet (90 to 120 cm) in every direction, and the flowering stems stand five feet (150 cm) or more. People who plant them at cabbage spacing end up with a thicket of leaves, poor air movement and small buds, and there is no way to fix it once the crowns are established.

Plan on three feet (90 cm) between plants as an absolute minimum and four feet (120 cm) if you have it, with the same again between rows. That looks absurdly generous when the plants are small in their first spring. By midsummer of the second year the leaves will be touching.

Put them somewhere permanent, at the back or the edge of the plot. They are in place for about four years, they cast serious shade on anything behind them, and they resent being dug around. A row along one boundary of the plot works far better than a block in the middle of a rotation.

On heavy clay, plant on a low ridge or raised bed six to eight inches (15 to 20 cm) above the surrounding soil. Winter wet in the crown kills more artichokes than cold does.

Feed them like the heavy feeders they are

An artichoke builds an enormous amount of leaf and stem every year and then flowers on top of it. Thin soil produces thin plants with small, scaly buds and very little heart. This is a crop where generous manuring pays back visibly in the size of the terminal bud.

Work in as much well-rotted manure or compost as you can spare before planting, and then mulch heavily every spring. Two liquid feeds during the growing season, one as the flowering stems start to rise and one just after you cut the first buds, keep the side buds filling out instead of stalling.

1. Mulch thickly in early spring Put two to three inches (5 to 8 cm) of well-rotted manure or compost around each crown as growth restarts, keeping it clear of the center. This is the main feed of the year and it also holds moisture through summer.
2. Feed as the flower stems rise A balanced liquid feed or a general fertilizer raked in when the stems begin to extend goes straight into bud size. This is the feed that decides how big the terminal bud gets.
3. Feed again after the first cut Once the terminal buds are off, feed again. The side buds are still filling and this is what keeps them from arriving small and hard.
4. Stop feeding in late summer Late nitrogen pushes soft growth that will not harden before cold weather. Let the plant slow down naturally so the crown goes into winter tough.

Pale, small leaves in early summer on an established plant almost always mean hunger, not disease. Feed first and see what happens before you look for a pest.

Watering: steady, deep and never at the crown

Artichokes have deep roots and dislike both extremes. Real drought during bud formation gives you small, tight, fibrous heads that open early. Standing water around the crown gives you rot. What you want is deep, infrequent soaking that wets the whole root zone rather than a daily splash.

The critical period is from the moment the flowering stems start to lengthen until the last side bud is cut. That is when the plant is moving the most water and when a dry spell does permanent damage to the crop you are waiting on.

1. Soak deeply, roughly once a week in dry weather Give each plant a thorough soaking that reaches down at least a foot (30 cm), rather than a light watering every day. Shallow watering keeps the roots near the surface where they dry out fastest.
2. Water the soil around the plant, not the center Aim the water at the ground out under the leaf spread. Water repeatedly poured into the crown encourages the rot that kills plants over winter.
3. Increase while buds are swelling From the first sign of a bud until the last one is cut, keep the soil consistently moist. Bud size is set during this window and cannot be recovered later.
4. Ease off after cutting finishes Once the last bud is off, normal rainfall is usually enough. Going into autumn on the dry side helps the crown survive winter.

Tidying the plant through the season

Artichokes do not need pruning in the ordinary sense, but they do need clearing. Old outer leaves yellow and collapse steadily through summer, and left in place they hold damp against the crown and hide slugs. Pull or cut them away whenever they go over.

Spent flowering stems are the other job. Once the last usable bud has been taken from a stem, cut it to ground level. Leaving a tall dead stem standing does nothing for the plant and channels rain down into the crown.

The shoots you thin out in early spring are not waste. Taken with a piece of root attached, they are exactly the offsets you use to replace the plant, so do the thinning when you are ready to plant them.

Four good years, then replace it

A globe artichoke is a short-lived perennial. It crops properly from its second year, peaks around the third, and by the fourth or fifth the center of the crown is dying out, the buds are smaller and the plant is more prone to rot. Nursing an old crown along is the most common reason a bed stops producing.

The replacement comes off the plant itself. In early spring, when the new shoots are six to ten inches (15 to 25 cm) tall, slice a strong shoot away from the outside of the crown with a piece of root attached and plant it as a new plant. Do this on a rolling basis so you always have plants at different ages and never lose a season.

Write down the year each plant went in and mark it in the ground. Once a row is established the plants all look alike, and guessing which one is four years old is how a bed quietly becomes unproductive.