so basically, when you are plant a plant, you can 'graft' it onto an existing plant on your lawn that belongs to the same family(e.g. pea, shroom, flower, root) as the plant you're planting, with an icon to signal it
if you graft a plant onto an old one, after an animation, the new plant replaces the old one, and the cost is reduced by 50% of the old plant, correct to the nearest 5 sun. plant revolution abilities of some plants are also activated.
sun bank now also shows how many sun you're going to actually spend for a plant.
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