Watering Pachypodium: Soak When Dry in the Growing Season, Keep It Dry Through Winter Dormancy

Water by season and by what the plant is doing

A Pachypodium stores water in its swollen trunk, so it shrugs off drought but rots easily when kept wet or humid. The key is to switch clearly between generous watering while the plant is in leaf and almost none while it is dormant, using the leaves rather than the calendar as your guide.

Soak, then let it dry completely

While the plant is in leaf, wait until the potting mix is dry all the way through, then water until it runs out of the drainage hole. Small, frequent sips keep the root zone constantly damp, which is exactly what damages the roots. Water deeply, then wait.

1. Judge dryness by weight Lift the pot right after watering to learn its wet weight. When it feels clearly lighter, it is time. A wooden skewer pushed to the bottom also works.
2. Water until it drains Pour slowly onto the mix at the base until water flows from the drainage hole. This flushes stale air from the root zone.
3. Empty the saucer Never leave the pot standing in water. Tip out the saucer after every watering so the bottom of the pot can dry.

Watch for humidity in rainy spells and heat

In long rainy spells, the mix dries slowly and the usual watering rhythm can leave it wet for too long. In hot weather, watering at midday heats the wet mix and stresses the roots. Check dryness more carefully at these times and choose your watering hour.

1. Skip watering in rainy weeks If the mix is not fully dry, wait. Keep the pot under cover in a breezy spot until it dries.
2. Water in the cool of the day In hot weather, water early in the morning or in the evening once the pot has cooled.
3. Drain a pot that got soaked If rain soaks the pot, tilt it to drain the excess and let it dry in a breezy, shaded spot.

Cut back when the leaves start to fall

As temperatures fall, the leaves turn yellow and drop one by one. This is the plant preparing for dormancy, and its roots are taking up less water. Space out waterings and give less each time. Tapering off gradually is easier on the plant than stopping all at once.

1. Lengthen the interval Once leaves start dropping, wait a few extra days after the mix dries before watering, and stretch the gap further as nights cool.
2. Give about half as much Wet only the top half of the mix rather than watering to drainage, and water on a warm morning.
3. Stop when it is bare When every leaf has fallen, stop watering and keep the plant in a bright spot until spring.

Dry winter rest and the spring restart

A dormant plant barely uses water, so watering in winter leaves cold, wet mix around idle roots and leads to rot. Keep it dry. In a warm, very dry room where fine roots may shrivel, a light drink that barely moistens the mix about once a month, on a warm morning, is the most you should give.

In spring, fresh leaves or flower buds at the tips mean the roots are active again. Do not soak the plant straight away. Start small and increase as the leaves open.

1. Wait for visible growth Restart watering only when new leaves or buds appear. Watering before that risks rotting roots that are still asleep.
2. Begin with a light drink For the first watering, just moisten the surface. Wait a few days and check that the plant looks well before watering again.
3. Return to deep watering Once the leaves are fully open, go back to soaking the pot whenever the mix is completely dry.

Reading watering problems

When the trunk wrinkles or leaves drop, watering right away can make things worse. Check the season, how wet the mix is, and how firm the trunk feels before you act.

When in doubt, stop watering and move the plant somewhere airy. Far more of these plants die from staying too wet than from drying out.