Pachypodium windsorii

Pachypodium windsorii key facts

Growing Difficulty

Advanced

Lifespan

Slow-growing and long-lived (little published data)

Size

0.5-1.5 m tall; caudex 35-60 cm across

Watering

Sparingly in the growing season

Light & Placement

Grow in full sun to light shade. It can go outdoors in sun in warm areas, but keep it out of winter rain.

Watering

Water sparingly in the heat of the growing season and not at all from late autumn to mid-spring. Older plants need less water.

Temperature & Overwintering

It is cold-sensitive; overwinter it completely dry at around 10°C and protect it from frost.

Soil & Repotting

Use a gritty, porous mix that is not strongly acidic. Repot about every three years.

Propagation

Mainly propagated by seed; fresh seed germinates well and seedlings are fairly easy.

Pests & Cautions

Pachypodium sap is toxic and the spines are sharp. Wear thick gloves or wrap the trunk in several layers of newspaper when repotting or moving it. As an Appendix I species, international trade in wild-collected plants is prohibited, so plants on the Japanese market are mainly seed-raised. Even so, check for a registration certificate before buying or listing.

About Pachypodium windsorii

Pachypodium windsorii: a slow-growing Madagascar caudex succulent with a flask-shaped caudex and striking red flowers, suited to experienced growers.

7 things to know before growing Pachypodium windsorii

1. 1Bright Light and Airflow

   Native to Madagascar's dry northern regions, Pachypodium windsorii thrives in strong light. Give it as much sun as possible, outdoors or near a bright window, with good air circulation. In peak summer sun it can scorch, so watch the leaves and consider light shading, introducing any change in light gradually.

2. 2Water by Season

   Water sparingly during the hot part of the growing season, and stop watering entirely from late autumn to mid-spring. The older the plant, the less water it needs. Overwinter it completely dry at around 10°C.

3. 3Use Fast-Draining Soil

   A dedicated caudex/succulent mix, or a blend of akadama, pumice, and perlite, works well for good drainage. Avoid soil heavy in organic matter, which stays wet and raises the risk of root rot. Always use a pot with drainage holes.

4. 4Repot During the Growing Season

   Repot in spring, as the plant begins actively growing. Because growth is slow and the caudex eventually reaches 35-60cm across, move up just one pot size at a time rather than repotting often. If roots are disturbed, let the plant rest dry for a while before resuming watering.

5. 5Keep Dry Through Winter

   Leaf drop in autumn is the plant's signal that it's entering dormancy. During this period keep it nearly dry and move it indoors to a bright spot, away from cold exposure. Protecting it from low temperatures matters, since cold can damage the plant.

6. 6Choosing a Healthy Plant

   Look for a caudex that's firm, without dents or damage. The twisting branch habit is characteristic of this species, so check for unnatural discoloration or spotting as well. Since growth is slow, the form you choose at purchase is one you'll enjoy for a long time to come.

7. 7Notably Short Flower Stalks

   Pachypodium windsorii's flowers resemble those of P. baronii, but its very short flower stalks are a key identifying feature. Flowering requires ample light and a well-established plant, and given the slow growth rate, it's best approached with patience.

Frequently asked questions about Pachypodium windsorii

Q.Is this a good plant for beginners?

A.Pachypodium windsorii is generally considered a plant for experienced growers. Without confidence in managing watering and light placement, it's easy to weaken the plant, so it's best approached after gaining experience with succulents or other caudex plants.

Q.How large does it grow?

A.At maturity it reaches roughly 0.5-1.5m in height, with a caudex 35-60cm in diameter. Since growth is slow, reaching this size takes many years.

Q.Does it need to come indoors in winter?

A.Yes - it's sensitive to cold, so keep it indoors in a bright spot during winter. This coincides with its dormant period, so cut back on watering and avoid exposing it to low temperatures.

Q.How is it different from Pachypodium baronii?

A.P. windsorii is generally smaller overall than P. baronii, and its flower stalks are notably shorter - the main distinguishing feature. The flowers themselves look similar, red with a pale green center.

Q.How long does this plant live?

A.It's described as slow-growing and long-lived, though detailed lifespan data is limited. It's a plant best enjoyed by watching its caudex change gradually over many years.

Handy Growing Tools for Pachypodium windsorii

Learn more about Pachypodium windsorii in the encyclopedia

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