Can I feed a monarch butterfly sugar water?

Yes, but it is always better to choose a natural diet, the nectar from fresh flowers. In a country like NZ there should be no need for artificial diets. Also in cold dry weather sugar water can form crystals inside the butterfly. A teaspoon of sugar in a cup of warm water (for it to dissolve). Add a drop of soy sauce to give minerals needed for reproduction. Use when cool.

Do not use honey as it could be spreading bee diseases.