Wintering of outdoor and container plants
The above-ground parts of the toxic castor will die off when it gets too cold. The roots survive, however. However, if it is very cold, the roots will also die. You can cover them with sticks, leaves, compost, or hay.
Castor oil in the bucket is overwintered as follows:
- cool but frost-free (e.g. winter garden)
- do not fertilize
- pour little
- from March fertilize again or repot if necessary
- put outside after the ice saints
If you cannot or do not want to overwinter the castor oil, tear out the stems in autumn and dispose of them on the compost. In spring you can re-sow the fast-growing plant.