sweet kate spiderwort foliage is now green and not variegated?

Question

Have had this plant for 4 years and now it’s all green

Answer 1

Plants with variegated leaves tend to revert back to the normal solid green with time. Certainly, most plants that grew from self-sown seed are unlikely to produce variegated leaves. More information is in this article: https://www.gardeningknowhow.com/plant-problems/environmental/variegated-plant-problems.htm