Chicago, Illinois

In season now

• Black Walnut

  Where: Scattered throughout Chicago parks, yards, and natural areas; common in older neighborhoods and forest edges.

  Green husks split in September; crack open to reveal hard black shell inside. Harvest when husk yellows, cure in sun 2–4 weeks before cracking.

  Look-alikes: Butternut (Juglans cinerea) has elongated, sticky nuts in clusters—rare in Chicago proper but check shape; black walnuts are rounder and solitary.

  Caution: Wear gloves; husks stain skin dark brown for weeks. Toxic juglone in husks kills many plants—keep away from gardens.

• Acorns (White Oak)

  Where: Under white oaks in parks, forest preserves (Montrose, Grant Park edges), and residential areas; white oaks have rounded leaf lobes.

  Caps sit shallow on nut; collect when they fall freely. Leach in cold water (change daily, 7–10 days) to remove tannins, then dry and grind or roast.

  Look-alikes: Red oak acorns are more bitter and take longer to leach; white oak acorns are milder and preferred.

  Caution: Only white oak acorns are palatable raw after leaching; red oak requires much longer processing.

• Wild Grape (Vitis riparia, V. labrusca)

  Where: Climbing vines on fences, trees, and along the Chicago River; common in parks and disturbed edges.

  Dark purple-black clusters ripen late August through September. Eat fresh or ferment; seeds are bitter but edible.

  Look-alikes: Poison ivy has three leaflets (not five) and white berries—grapes have opposite leaves and purple fruit.

  Caution: Confirm five-leaflet arrangement and purple fruit before harvesting; avoid vines touching poison ivy.

• Autumn Olive (Elaeagnus umbellata)

  Where: Thickets in forest preserves, disturbed areas, and roadsides; invasive shrub with silvery leaves.

  Red berries with silver speckles ripen September–October; tart, astringent—best in jams or dried. High in lycopene.

  Look-alikes: Goji berry (Lycium) has similar leaves but orange berries and thorns; autumn olive is thornless.

  Caution: Invasive species—harvest liberally to help control spread.

• Pawpaw (Asimina triloba)

  Where: Understory of forest preserves and ravines (especially Des Plaines River valley); prefers moist, shaded areas.

  Custard-like fruit ripens late August through September; yellowish when ready. Eat fresh or freeze pulp; seeds are toxic.

  Look-alikes: No dangerous look-alikes; distinctive tropical appearance and smell are unmistakable.

  Caution: Fruit bruises easily; harvest by hand and use within days. Seeds contain alkaloids—discard.

• Elderberry (Sambucus nigra)

  Where: Wet edges, stream banks, and disturbed areas throughout Chicago; common in forest preserves and along the Chicago River.

  Dark purple-black clusters ripen September; cook before eating (raw berries cause stomach upset). Strip berries from stems with a fork.

  Look-alikes: Water hemlock (Cicuta douglasii) has white flower clusters and purple-blotched stems—never present at berry stage; elderberry has black berries.

  Caution: Only ripe black berries are safe; green and red berries are toxic. Cook all berries thoroughly.