If you grow thunbergia in a pot, once the season is done, bring the plant inside and let it die. It will make a mess while it's dying, but you'll find the broken open seed pods and lots of seeds. Maybe some plastic under the dying plant would help to contain the mess and collect the seeds. Attached is a picture of the seed pod and a seed (small, brown, and nubby). It was my first year growing thunbergia, but now I plan to grow this in pots on either side of my front door every year!
Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.
Seeds are easy to collect from Thunbergia. When the flower drops off, you will see a seed pod remains. Let it turn brown (dry) and they will pop off easily.
If you're growing it in a pot, once the season is done, bring the plant inside and let it die. It will make a mess while it's dying, but you'll find the broken open seed pods and lots of seeds. Maybe some plastic under the dying plant would help to contain the mess and collect the seeds. See pictures of the seed pods and seed here: wwwsrc.thriftyfun.com/
If growing in the ground, try putting a barrel bag around the plant after it starts to die from frost. Then it's the same instructions as above, easy!