Shipping plants is a risky business because the probability that the plants will be damaged are higher compared to electronic items, clothes, furniture, hardware and other items. In India, it is observed that many plant sellers are using Fedex.
Bunnycart which is selling aquatic plants is using Fedex , plants were in fairly good condition.
Similarly Nurserylive is also using Fedex according to an online review
Fernspetals is using Bluedart/DHL
Some couriers are not transporting any plants, so it appears that all plant sellers are forced to use Fedex, giving them a monopoly in the market.