How to revive False Sunflower?

Hi, I am a novice gardner and beginning to garden with simple, easy to grow wildflowers and the likes. I planted a couple of young false sunflowers and a coneflower plant I bought from Home Depot. They are in direct sunlight in a well drained moist soil. The coneflower is blooming but looks weak and twiggy with a lot of yellow dry leaves at the base of the plant. Both the false sunflower plants lost all their foliage. I simply trimmed them down to a couple of inches above the ground level. It has been a week now and the bare stems still seem firmly rooted. Is there any way I can revive these false sunflower plants? Please help. I love plants, but I am so bad at gardening. I spent about $300 on yard services and new plants from an "arborist" and I cannot afford any more this season. Please help.
Cheers, Sapn
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.