A perennial North American native that produces edible, knobby tubers with a crisp, nutty flavor similar to Jerusalem artichoke but with a somewhat milder taste.
Helianthus strumosus · also called pale-leaf woodland sunflower, wild sunflower choke
Windows are counted from the average date of your last spring frost.
Helianthus strumosus is a low-input perennial that returns reliably each year from overwintered tubers, requiring minimal fertilizer once established. Its tubers store well in the ground and can be harvested across a long autumn-to-winter window.
A little history. Native to eastern North America, H. strumosus is closely related to Jerusalem artichoke (H. tuberosus) but typically produces smoother, less knobby tubers and has paler leaf undersides — a distinction noted in Gray's Manual of Botany.
Sow seeds 4 inches (102 mm) deep, and aim for 18 inches (45 cm) between plants once thinned. Plant tuber pieces 3–4 inches deep with at least one visible bud eye; keep soil evenly moist until shoots break the surface. Seedlings emerge in 14–28 days.
Deep soak once or twice a week during active growth; reduce once tops yellow in fall. Water when the top 2 inches of soil feel dry to the touch. Aim for about 1 inch per week including rain.
Side-dress (scatter fertilizer along the row and water in) once in early summer when plants reach 12 inches tall. What to use: balanced compost or a low-nitrogen 3–5-5 organic blend; excess nitrogen favors tops over tubers.
Pinch out the central growing tip when plants reach 24–30 inches to encourage branching and potentially increase tuber set; remove spent flower stalks after bloom to redirect energy belowground.
It's ready when dig after the first hard frost kills the tops, when foliage has fully yellowed and died back — tubers are at peak starch-to-sugar conversion at this point. Loosen soil with a fork 8–10 inches from the stem base; lift the root mass and pick off tubers by hand. Leave several small tubers in place to regrow next season.
Store unwashed tubers in a perforated bag with slightly damp sand or peat in a refrigerator or cold cellar at 32–40 °F (0–4 °C) for up to 3 months. Alternatively, leave in-ground and dig as needed.
As a perennial, succession sowing is not applicable — manage the existing patch by thinning crowded shoots each spring to maintain vigor.
Tubers are fully cold-hardy and overwinter in the ground without protection in most temperate climates. In areas with prolonged frozen soil, mulch the bed with 4–6 inches of straw after tops die back to ease spring digging.
Pole Bean
The stout stems make a living pole for beans once the sunflower choke is knee-high, saving you a trellis — set the bean seed about 3 inches out from the stalk. The nitrogen the beans bank in their roots is mostly released for next season, as those roots break down.
Sweet Corn
Gardeners have long lined these two tall crops along the same bed edge so their shade falls outside the growing space. No mechanism has been demonstrated, and both are hungry for water and light, so give each its own 18 inches of room.
Nasturtium
Aphids often settle on nasturtium ahead of nearby crops, pulling colonies off young sunflower choke shoots. It only pays off if you pull and bin the infested nasturtium stems rather than letting the colony build and spread.
Borage
Borage's long run of blue flowers brings in hoverflies, lacewings and tiny parasitic wasps, whose larvae can keep aphid clusters on stem tips from building. Plant it at the sunny edge of the patch so the flowers stay above the foliage.
Jerusalem Artichoke
Close relatives that host the same white mold and powdery mildew, so side-by-side planting stacks the risk in one bed. Their tubers also intermingle underground and are hard to tell apart at digging — keep the two patches in separate beds.
Potato
Both host white mold, and both feed the same soil-dwelling wireworms that tunnel tubers, so the pressure often builds where they share ground. Digging potatoes also chops the sunflower choke's shallow rhizomes and scatters unwanted regrowth.
A perennial — it holds its spot for years, so it sits outside the annual rotation.
A perennial patch, so it stays put rather than moving through rotation and no family gap applies. A moderate feeder that leaves loose, deeply forked soil behind. When you retire a section, sow a legume cover crop such as crimson clover, and keep other daisy-family crops out for two years.
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