Actually, if conditions are favorable the plant will keep getting larger and larger. When it was 60-70 degrees F indoors, my D. burmannii became very large when I fed each leaf. They also produced massive flower stalks with about 30+ flowers per stalk. Each stalk had ~100 seeds, so that's a ton. However, when warm temps came along (85 degrees F), they started getting smaller and smaller, and now they are just barely hanging on.
Anyone who wants to see some pics of D. burmannii can check out this page:
http://www.growsundews.com/sundews/burmannii.html