Regarding Sunstorm apricot and Pacifica cherry red varieties of Catharanthus roseus (Vinva rosea)

Question

Dear Sir/ Madam,

I am a research student from India, working on Catharanthus roseus var. Sunstorm apricot (Syngenta seeds). I am facing some problems with the plant.
The pods don’t seem to mature to bear seeds. They remain very small without growing. I will be in trouble if my experimental plants don’t bear seeds. I faced the same problem with the variety Pacifica cherry red (Pan American seeds), also

I am growing them in coir pith based medium. They are growing and flowering well. But, the pods are not maturing. Is this a common phenomenon or should I change something? like, growth medium or fertilizer?

I would be grateful if you could help me out with this problem.

Looking forward to your reply,

Thank you,

Regards,
Nishanth

Answer 1

This link may help you.

http://extension.uga.edu/publications/detail.html?number=B1219