The animation that shows the seeds being planted should end with the plant sprouting out of the ground. The next day, when your Tamagotchi character goes into her yard, another animation should play, showing the plant growing. There's a 10% chance that when the plant grows, you'll not harvest anything; there'll be a bug inside. There's no way to effect the chance of the bug appearing. There's also a chance that instead of growing, the plant will wither and die. This chance is related to how empty your character's friendship meter (in the stats screen) is. So, you should check her stats and fill up her friendship meter before you allow her into the yard. Note: if you use a time travel cheat, be aware that your character's friendship meter empties a bit when she gets dirty (as happens over time, if she doesn't bathe.)