Cannas are heavy feeders and
respond well to extra nutrition and good watering especially during the
strong growing months.
Adding a little liquid fish emulsion or
fertilizer every other watering will keep them growing strong. They can
also be side dressed with good humus or a non-burning fertilizer every
few weeks. If pests are noticed, take care of them immediately so they
will not become a problem.
Also, as a stem finishes blooming, the
spent heads can be removed and cut back to the foliage of the plant. If
the plant will still maintain its form, and the stem does not contribute
to its beauty, it can be cut all the way to the ground.
In a short
time, a new shoot and stem will come up to take its place.
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