When you water:
Water the entire planter pot. All the soil needs to be wet, not just a circle around the stem. I don't know where that came from but it's silly.
You water the entire pot and then watch the plant. When it has what it needs, the leaves will stand up and reach for the light.
Reaching is what you want. When the plant is reaching, that means it's growing roots and stretching. When the plant starts to run out of water, the leaves will begin to lower from the raised position. When they get roughly level, then you water. Water the entire pot each time and then wait until the plant asks for water, not just on schedule.
This includes seedlings, the difference is that you can't always see the leaves on a seedling.