Go to your Tree of Wisdom and use up all your tree food. It will show that you have 0 now, but go to the icon and drag the bag and you may have an extra. Go back to your Zen garden and then right back to your Tree of Wisdom, Crazy Dave will now give you another 5 bags. In order to repeat this use up all 5 bags then drag an extra time for a sixth bag. Repeat the process.