Any botanicals effective in improving male fertility?

Possibly. Fertility in men is related to quantity of health sperm. There exist hundreds of studies showing a positive effect of nutritional supplementation on fertility. Ginseng is used traditionally used to improve male fertility, maca has also been shown to increase seminal volume, and sperm motility.
Pycnogenol. I published a study showing improvements with pycnogenol. We also use coast reproductive male fertility supplement.