Size Or Color When Ripe:
Harvest when the skin of the fruit is shiny and unwrinkled. Don’t wait too long to harvest! As soon as the skin does not rebound to gentle pressure from your finger, it’s ripe. When harvesting, do not pull the fruit (as it won’t come off). Cut the fruit with a sharp knife or pruning shears close to the stem, leaving about an inch of it attached.
Dull skin indicates that an eggplant is overripe.
Days Until Maturity: