Checking the health of the bush gives 2200 farming experience. The bush releases a wishing well fruit when given an appropriate amount of coins, relative to the player's total skill level. This fruit will contain items of up to three times the value of the coins used. In order to open the fruit, 8 free inventory spaces are needed. Once a fruit is picked, a new bush must be planted and grown in order to buy a new fruit.
Or, alternatively, the bush may be cleared (right click option) and re-planted with a new seed, without having picked the fruit first.