I read this "It may still come back if watered. I've had that happen more times than I'd like when emergencies have come up and I had to leave the garden. Keep watering them deeply for another week and watch for any new leaf formation coming out where the old ones were on the green stem. Leaf loss happens when they go "dormant" with heat and dryness. Prolonged dryness will turn dormant into dead though. If nothing changes or the stem goes brown you will need to yank the plants. Save the seed if it has developed enough and start seedling now. The seedlings may need some very light shade when they sprout and more frequent watering than the parent did until they establish."
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Check the plants for any signs of insects or animal damage.
Please finish your question so that we will be able to help you solve your dilemma with your plants.
I read this "It may still come back if watered. I've had that happen more times than I'd like when emergencies have come up and I had to leave the garden. Keep watering them deeply for another week and watch for any new leaf formation coming out where the old ones were on the green stem. Leaf loss happens when they go "dormant" with heat and dryness. Prolonged dryness will turn dormant into dead though. If nothing changes or the stem goes brown you will need to yank the plants. Save the seed if it has developed enough and start seedling now. The seedlings may need some very light shade when they sprout and more frequent watering than the parent did until they establish."
At: http://www.city-data.com/forum/garden/1307207-rudbeckia-perennial-other-confusing-questions-flowers.html#ixzz4rv3rLnjU
Hope that's what you were wanting to know.