Mulching plants close to Jackfruit

Now a days, every time I plant a sapling, I plant couple of Mexican sunflower cuttings and also few grass clumps, this could be Super napier or some grasses which grows naturally in the farm. Mexican sunflower cuttings decompose very quickly while grass cuttings decompose very slowly.

The picture shows the jackfruit sapling after mulching with mexican sunflower and grass.