You can prepare the stems like you would asparagus. My Mom steamed them then added lemon juice, garlic, salt and pepper. Yum!!! Here's a photo of our steamed Spiderwort stems with spaghetti. Even my sisters thought it tasted good.
My sister Lily got involved with removing the flowers and my Mom made a candied flower with it. She coated it with egg whites then sprinkled sugar on them and let them dry. They were good too!
Even the chickens enjoyed the Spiderwort! Hey, waste not, want not!