Boswellia

Boswellia key facts

Growing Difficulty

Advanced

Lifespan

30+ years

Size

20-80cm

Light & Placement

It prefers full sun and tolerates hot, dry conditions well. In the growing season, keep it outdoors in a sunny, airy spot.

Watering

Water moderately in the growing season after the soil dries. It dislikes wet soil, so let the pot dry out well, and withhold water in winter.

Temperature & Overwintering

Sensitive to cold and wet, so it must overwinter indoors in Japan. Keep it in a warm, dry, bright spot.

Soil & Repotting

An extremely fast-draining mix suits it. Growth is slow, so repot only when root-bound, during the growing season.

Dormancy Care

It drops its leaves and rests in the dry season. Once leaves fall in winter, stop watering and resume when new growth emerges in the growing season.

About Boswellia

Boswellia belongs to the family Burseraceae and is famous as the source of frankincense, a resin prized since antiquity for religious ceremonies and perfumery. Boswellia neglecta is native to the arid rocky terrain of Ethiopia, Kenya and Somalia, where it has developed a swollen, knobby trunk and base as an adaptation to harsh, drought-prone environments — a trait that makes it highly sought after among caudex plant enthusiasts. Growth is remarkably slow; the sculptural forms shaped by wind, drought, and time give each specimen a deeply individual character, like a living sculpture. Leaves are small and compound, flushing green during the growing season and dropping in the dry season or winter, at which point the full drama of the swollen trunk takes center stage. In cultivation, its tolerance for drought is a genuine advantage, but understanding its sensitivity to cold and excess moisture and embracing its slow pace are essential for long-term success. A rare plant that combines striking visual presence with a history stretching back thousands of years.

7 things to know before growing Boswellia

1. 1Strong Light Is Essential

   Boswellia has adapted to intense sunlight in its native habitat, so providing as much direct sun as possible is key to healthy growth. When kept indoors, place it near a south-facing window or supplement with a grow light. Insufficient light causes elongated, weak growth that detracts from its naturally compact sculptural form.

2. 2Water Only After Soil Dries

   Even during the growing season (spring to autumn), water only a few days after the soil has completely dried out. Because Boswellia stores moisture in its caudex, it tolerates drought far better than most plants, and overwatering poses a much greater risk. Choose a well-draining soil mix and a pot with good drainage holes to prevent root rot.

3. 3Go Dry in Winter

   From late autumn through early spring, as temperatures fall, it is standard practice to withhold water almost entirely and allow the plant to go dormant. Continued watering during this period significantly increases the risk of root rot. Leaf drop during dormancy is common and normal — the plant has not died.

4. 4Keep It Warm Year-Round

   Native to hot, arid regions, Boswellia is highly susceptible to cold damage below 10°C. In Japan, always bring it indoors to a warm spot during winter and keep it away from cold window drafts and frost. Treat 10–35°C as the suitable temperature range for the plant.

5. 5Use a Gritty, Fast-Draining Mix

   Start with a commercial succulent or cactus mix, then amend it with pumice, perlite, or coarse sand to further improve drainage. High organic content retains too much moisture and encourages root rot. Unglazed terracotta pots or shallow containers improve airflow around the roots and make management easier.

6. 6Expect Very Slow Growth

   Boswellia is an exceptionally slow-growing plant that takes many years to develop into a large specimen even in its natural habitat. Expect minimal visible growth from year to year, and approach cultivation with a long-term mindset. This slow growth is part of why mature specimens with well-developed forms are rare and highly valued in the market.

7. 7Handle Resin with Care

   Boswellia species produce frankincense resin and may exude a white sap when branches are broken or damaged. Skin sensitivity to this sap varies between individuals, so wearing gloves during repotting or pruning is advisable. Keep the plant out of reach of small children and pets to prevent accidental ingestion.

Frequently asked questions about Boswellia

Q.How fast does Boswellia grow?

A.Boswellia is an exceptionally slow grower, and it is not unusual to see almost no visible change in a year. Providing adequate sunlight, careful watering, and warm temperatures will encourage steady, healthy growth, but it is best approached as a long-term project rather than expecting rapid results.

Q.Can Boswellia be kept outdoors in winter?

A.Outdoor winter care is not recommended in most parts of Japan. Boswellia is sensitive to cold, and frost exposure can be fatal. Once temperatures drop below 10°C, it should be moved indoors to a warm, bright location.

Q.All the leaves have dropped — is my plant dead?

A.Many Boswellia species naturally drop their leaves in response to dry conditions or cooler temperatures — this is a sign of dormancy, not death. As long as the trunk remains firm and there is no discoloration or smell of rot, your plant is fine. Reduce watering and wait for warmer spring temperatures; new growth should emerge.

Q.What type of soil should I use?

A.A highly well-draining mix is essential. A base of commercially available succulent or caudex soil blended with around 20–30% pumice or perlite works well. Standard potting soil with high organic content retains too much moisture and significantly increases the risk of root rot, so it is not suitable for Boswellia.

Q.What should I look for when buying a Boswellia?

A.Check that the trunk is firm and turgid, with no soft spots, discoloration, or signs of damage. It is also reassuring to check that the base is stable and shows no signs of root rot. Purchasing from reputable specialist stores or established plant events is strongly recommended.

Handy Growing Tools for Boswellia

Learn more about Boswellia in the encyclopedia

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