Hi Joan,

Croton Mammy Plant

Crotons tend to lose leaves when they are severely over-watered or under-watered. It looks like your Croton is in a container that does not have drip holes in the bottom ?? Is that true? If the answer is yes, the plant is probably over-watered. All houseplants should be in pots that have drip holes. You can then set them in a clear deep plant saucer and then place plant & saucer into a decorative container. If you don’t think it’s a watering issue, the other cause may be spider mitesLearn how to identify and treat Spider Mites on plants. This sucking plant pest causes yellow blotchy leaves with a red haze and a gritty feel to them.. You can read about spider mitesLearn how to identify and treat Spider Mites on plants. This sucking plant pest causes yellow blotchy leaves with a red haze and a gritty feel to them. and how to treat them in the Glossary of the website.

https://www.houseplant411.com/glossary/spider-mite-plant-pests