Benzelsanswered grow question 3 years ago You can plant 10 seeds from the same pack and get 10 plants that all look slightly diff and grow diff too. Maybe one got too much water once and another had root issues ect ect.. they never grow the same height unless you train them to all grow the same height- If you just let em grow semi wild they will all be diff sizes in the end ok. Its got nothing to do with the light. Same thing happens outdoors under the sun too. If your not tying down the tallest branches to keep them the same height as the rest then what do you expect to happen my friend?