Goji Berries

Goji berries (Lycium barbarum) are among the most broadly adaptable fruiting shrubs available to home gardeners. Drought-tolerant once established, alkaline-soil friendly, and free of the specific climate demands that limit many fruit crops, goji performs across a remarkably wide range of North American growing conditions — from the arid intermountain West to the humid mid-Atlantic to the cold northern Plains.

The fruit itself is vivid scarlet-orange, oval, and ½ to 1 inch long. Fresh, ripe goji berries are mildly sweet with a flavor often described as a blend of tomato, cranberry, and raisin — juicy and pleasant, with none of the bitterness of underripe fruit. They ripen in waves from late summer through frost, allowing extended harvests over several weeks rather than a compressed window that requires immediate processing. Dried goji berries — by far the most common commercial form — concentrate the flavor into something sweeter and chewier, excellent for trail mixes, baked goods, tea, and smoothies. Berries also freeze well for long-term storage.

Goji vines are ornamental as well as productive. The small, purple, five-petaled flowers bloom along flexible arching canes from late spring through summer and are attractive to bees. The vivid scarlet fruit that follows is striking in the landscape and supports birds, though bird netting will be necessary if you want to keep your harvest.

The most important considerations before planting are drainage and pH. Goji tolerates a wide range of soils but demands excellent drainage — roots are sensitive to prolonged waterlogging, and poorly drained sites are the most common cause of failure. Unlike most fruits, goji performs well in neutral to mildly alkaline soils (pH 6.8–8.1), making it an excellent choice for regions where soil pH is too high for blueberries or raspberries.

Sun and exposure

Goji berries require a minimum of 8 hours of direct sunlight measured in early summer (late June through early August) for reliable production. Sun exposure drives flower bud initiation for the following season — without adequate light, flowering and fruit set are reduced. Carbohydrate production and fruit flavor development are also directly tied to sun exposure.

In hot, dry climates where temperatures regularly exceed 85°F during the growing season, afternoon shade is beneficial. Flowers and developing fruit can fail to set properly at sustained high temperatures above 85°F. In the Pacific Northwest and most cool-temperate locations, this is not a concern — site for maximum sun to ensure good ripening and fruit development.

Avoid frost pockets and low-lying areas where cold air pools on still, clear nights. Goji breaks dormancy and begins new growth in spring — that tender new growth is frost-sensitive even though the dormant crown and roots are quite cold-hardy.

Soil and drainage

Goji tolerates a wide range of soil types — sandy, loamy, or moderately clay — but drainage is non-negotiable. Avoid any site where water pools after rainfall or where the soil remains saturated for extended periods. If your native soil is heavy clay, amend the planting area with coarse compost and plant on a slight raised mound to encourage drainage away from the crown.

Unlike most fruits, goji performs well in neutral to mildly alkaline soils. The preferred pH range is 6.8–8.1, with an optimum around 7.0–7.2 (Raintree Nursery; GrowOrganic.com). Test your soil pH before planting — if it is acidic (below 6.5), raise it with ground limestone. Goji does not require the acidic conditions that blueberries, raspberries, or kiwi demand, and alkaline amendments that would harm those crops will benefit goji. Avoid high-nitrogen fertilizers and acidic amendments.

Improve the planting area by working 1–2 inches of plant-based organic matter (compost, aged wood chips, or coconut coir) into a zone 1.5–2 times the diameter of the planting hole and up to one foot deep. For containers, use a potting mix amended with compost, sand or perlite for drainage, and lime to bring pH to the 6.8–7.0 range.

Spacing

Space goji plants 4–6 feet apart in the row for managed, pruned shrubs. This spacing promotes good airflow and light penetration, simplifies harvesting, and reduces disease pressure. If you intend to trellis plants or allow more vigorous growth, increase spacing to 6–8 feet. Allow sufficient room for the root system as well — goji sends out lateral roots and suckers; surrounding the base with landscape fabric or maintained bare soil helps contain the plant's spread.

Goji berry is self-fertile — a single plant can produce fruit without a second pollinator variety. This is a meaningful advantage for small gardens or growers with limited space. However, like many self-fertile plants, goji often produces larger crops and more consistent fruit set when a second genetically distinct plant is present nearby. Utah State University Extension and several other sources note that hand pollination may be needed in areas where bee activity is limited.

Bees are the primary pollinators of goji flowers. The small purple blossoms are attractive to honeybees and native bees from late spring through summer. Avoid applying insecticides during the bloom window — goji blooms over an extended period, and pesticide applications during active flowering will reduce pollination and fruit set.

In the PNW, cool spring temperatures can suppress bee activity during early bloom. If you observe open flowers but poor fruit set in a given year, hand pollination with a soft brush — transferring pollen from flower to flower in the morning when blooms are freshly open — is a practical supplement.

Goji is still a relatively new crop in North American home gardens, and named cultivar availability is more limited than for established fruit crops. The varieties below are the most widely grown and available; Raintree's catalog reflects current stock. Selecting a named cultivar from a reputable nursery is strongly preferred over unnamed seedling stock — cultivar selection ensures consistent plant quality and fruiting performance (Utah State University Extension).

When to plant

Plant container-grown goji in early spring after the last frost date has passed, or in fall at least 6 weeks before the ground freezes. Bare-root stock should be planted in spring before the plants break dormancy — soak bare roots in water for 12–15 hours before planting to ensure the roots are fully hydrated and to minimize transplant shock. For container stock, water the plant thoroughly an hour before planting.

Planting steps

Dig a hole twice as wide as the root ball and approximately the same depth. Backfill with amended native soil. Set the plant at the same depth as it was in the container — the crown (where stem meets root) should be level with the surrounding soil surface, not buried. Do not add fertilizer directly into the planting hole — it can burn tender new roots. Water thoroughly after planting and apply a 2–4 inch layer of mulch (straw, leaves, or wood chips) immediately, keeping mulch pulled back 4–6 inches from the crown to prevent rot and deter vole activity.

If you plan to trellis or train the plant against a fence or wall, install supports at planting time. Beginning to tie and guide canes in the first season establishes the framework you will work with for years to come. Goji canes are flexible when young — this is the easiest time to direct them.

Left unpruned, goji grows as an open, sprawling multi-stemmed shrub with arching canes that root where they contact soil — attractive as a hedgerow plant but inefficient for fruit production and difficult to harvest. Annual pruning and some form of training significantly improve yield, fruit size, air circulation, and ease of harvest. The good news: goji fruits on the current season's new lateral shoots arising from last year's wood, so annual pruning renews productive wood and keeps the plant manageable.

Choose your training approach

Annual pruning — late winter / early spring

Prune goji during the dormant season — late winter to early spring, as buds begin to swell (Thompson & Morgan; GrowOrganic.com; Old Farmer's Almanac). Waiting until buds begin to break makes it easier to identify winter-killed wood, which should be removed first. Unlike kiwi, goji does not bleed heavily from late-season cuts, so the timing window is broader — late January through March in most temperate climates.

During annual pruning: remove any dead, damaged, or crossing branches; shorten lateral branches by approximately 12 inches from their tips to encourage new productive shoots; remove any of the oldest, thickest canes that are producing less vigorously than younger replacement canes — these can be cut to the ground, as goji readily regenerates from the base. Remove all suckers arising from the root zone unless you want to establish a new plant from them (suckers can be dug and transplanted successfully).

In late spring or early summer, pinch off the top 2–3 inches of terminal growth on new shoots to encourage lateral branching — this is where most fruit will develop. This "tip pruning" is analogous to pinching snapdragons or dahlias and significantly increases fruit-bearing laterals on young plants.

Established goji is notably drought-tolerant compared to most fruiting plants — one of its most valuable traits for growers in dry or water-limited regions. That said, consistent moisture during establishment and during fruit sizing and ripening meaningfully improves yield and fruit size. Young plants in their first 1–2 seasons require regular, deep watering to build the root system that underpins that eventual drought tolerance.

For established plants, target approximately 1 inch of water per week over the root zone during the growing season — equivalent to 7–10 gallons per week for a typical 3-foot-diameter planting area. Water deeply once or twice a week rather than lightly every day. The soil should be moist but not soggy to about 12 inches deep; the top inch or two may feel dry and the plant still be adequately watered. Drip irrigation is ideal: it delivers water to the root zone while keeping foliage dry, reducing powdery mildew risk.

In the PNW, spring rainfall typically reduces supplemental irrigation needs through May or June. Supplemental watering becomes more critical in July through September — exactly when fruit is sizing and ripening.

Goji requires minimal fertilization. Excessive nitrogen produces vigorous leafy growth at the expense of fruit and increases pruning workload. A single application of a balanced organic fertilizer or 2–3 inches of well-rotted compost over the root zone in early spring is generally sufficient. Avoid fertilizing after early summer — late-season nitrogen encourages soft new growth susceptible to winter damage. If the plant is producing adequate new growth and has healthy green foliage, additional fertilizer may not be needed at all.

Maintain a 2–4 inch mulch layer of straw, leaves, or wood chips over the root zone year-round to conserve moisture, moderate soil temperature, and improve soil structure. Keep mulch pulled back 4–6 inches from the crown to discourage crown rot and vole activity.

Goji berries ripen in waves from approximately late July or August through the first hard frost — ripening is indeterminate, meaning individual berries on the same plant ripen at different times over a multi-week window. Check plants frequently as the season advances and harvest ripe berries every few days.

How to tell when ripe

A ripe goji berry is fully orange-red, slightly soft to gentle pressure, and detaches cleanly from the stem with a gentle sideways tug (pulling straight back often crushes the soft fruit). Underripe berries are orange, firm, and may be slightly bitter or bland. Do not harvest too early — flavor and sweetness develop fully on the vine. If a berry does not release easily, it is not ready.

Harvest into shallow containers to avoid crushing fruit at the bottom. Ripe fresh berries bruise easily — one of the reasons dried goji dominates commercially. Handle gently and avoid piling fruit more than 1–2 layers deep.

Alternatively, spread a tarp or fine mesh netting under the plant and gently shake each cane — ripe fruit will drop; unripe fruit will hold. This method is fast but requires sorting and immediate processing of dropped fruit.

Goji can be grown in containers, though it is not a long-term container plant for most growers — the vigorous root system and suckering habit make pots limiting after several years. That said, container culture is practical for patios, decks, or wherever in-ground planting is not an option, especially with attentive management and a single-trunk training approach.

Use a minimum 10-gallon container (Raintree Nursery recommendation); 15–20 gallons will better support a productive, multi-year plant. Use a quality potting mix amended with compost, coarse perlite or sand for drainage, and lime to raise pH to the 6.8–7.0 range — garden soil and unamended potting mix are typically too acidic. Gradually increase container size over the first several years rather than starting in a very large pot; this supports healthy root development and prevents waterlogging in excess soil volume.

Container goji requires more frequent watering and more attentive fertilization than in-ground plants — the root system cannot range broadly for moisture and nutrients. In Zone 6 and colder, container roots are vulnerable to freeze in winter; move containers to an unheated but frost-protected location (garage, outbuilding) once the plant is dormant. Provide a sturdy stake or trellis support within the container.