Question
Hello!  I have a white Calla lily that is starting to turn brown.  Should I cut it back and stop watering?  I live in Japan so the winter is mild.  Right now it is inside but I can put it out if necessary.

I also had an orchid (small red blooms), that now has a white fungus growing on the leaves and base.  What did I do wrong?  What dampness should it be kept at?  It was doing really well for a long time.  

Thank you so much!  Stacey

Answer
Hi Stacey,

Normally Calla lilies are spring bloomers. Ones that are sold now are hybrids that have been forced. That makes future flowering problematic.

For now, provide as much light as possible to extend its longevity, do not repot it, and water the soil thoroughly as soon as the surface of the soil feels very dry to the touch. There is no need to fertilize it at this time. Providing good light and proper watering is all that you can do for it while you enjoy the flowers as long as they last, which can vary considerably.

Normally, Callas need a dormancy or semi-dormant period after the finish flowering. But because yours is a forced hybrid, there is no guarantee that it will flower again. During a dormant period of several months, keep it cool and allow the soil to dry out very deep into the pot. Some of the leaves will yellow, but that is expected. Eventually, you should see some healthy new growth. At that time you can resume normal watering and start fertilizing.

Getting Calla hybrids to re bloom is a lot of work and often doesn't work. That is why most people discard their Callas after they have finished flowering.

It is quite unusual for fungus to grow on Orchids. To tell you more I would have to know what species of Orchid you have and also what potting medium it is planted in. Some good photos sent to me at [email protected] would also be helpful.

Regards,
Will Creed