Q.Moon plants
Do the plants produce seeds as they start to die out?

Downtoearthdigs
Answered on October 31, 2015
Moonflowers produce a seed pod after the flower petals drop.
The seeds are not mature until the pod dries. It should turn brown and feel brittle.
Pick them before they break open.
Each of the seed pods will contain 2 to 4 seeds.
Make sure the seeds dry completely before placing in jars or envelopes to store for next spring.
https://www.gardeningknowhow.com/ornamental/vines/moonflower/growing-moonflowers.htm
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