Talkback: Rhubarb bursts forth
Flowering can sap plants of their strength, so always cut away flower stems at their base as soon as they develop. You don't want rhubarb wasting energy on forming flowers. Keep watering clumps with a liquid feed to encourage new growth. If teh clump does appear weak then it may need lifting and dividing next winter, replanting into soil enriched with compost to help reinvigorate growth.