Seeds Glitch

Another glitch you may encounter (maybe it's just me?) while playing Sims 3 is not being able to pick up seeds off the ground.
If you don't know by now, the process goes: find seed>pick it up and it goes in your inventory>go to build/buy mode>place the seed from your family inventory onto some nice dirt and have your sim plant it in that spot back in live mode. WELL NOW. This worked for me the first time I tried to make a garden, and it my garden was quite exquisite if I do say so myself. However, I recently started a new game, and I am unable to pick up anymore seeds. When I hover my green ray of light over the seed, it doesn't outline the seed or give me an option to pick it up anymore. **This still works with rocks, however**. Why is this? I have no answer besides the fact that it must be a glitch. I've tried to solve this by restarting my game, but still nothing. /: If anyone has a solution, Yoshi and I would LOVE it. If I figure something out, I shall update it in the comments!