talking to your plants and singing to them help with plants. Also the good harvest symbol written on the ground or on a paper beside it might help. It's a native american symbol, the symbol looks like rain. It will bring you a good harvest and good rain. If you do a rain dance when it's cloudy outside that might help too.
In addition to expressing positive energy and thoughts, perhaps you might want to try growing your exotic plant in its optimal growing conditions. Try reading up to make sure what kind of soil to use, the different growing methods, the best light and air flow conditions as well, and make sure to find out the plants optimal watering frequency and volume. In my experience having other healthy plants around encourages the little seedling to sprout as well. Ashay!