2. The first is the lack of light, the maintenance environment is not enough light, mint leaves will be thin and long, find ways to increase light can be improved.

3. The second is to give enough water, usually too much watering, mint leaves will be thin and long, each time the best soil is close to dry and then water.

4. The third is not enough nutrients, mint leaves will be thin and long, timely supplemental fertilizer can be improved.