Wonderful, Yes saving plants and harvesting the water to reutilize them is a sustainable practice for Gardening. You can follow below steps.
- Rooftop Rainwater Harvesting - Equip you Roof top with Rain water harvesting equipments
- Rain Barrels and Drums
- Recharge Pits and Soak Wells
- Percolation Ponds and Trenches
- Modular Rainwater Harvesting Systems
You can use these suggestion according your Garden, If you want to know more in detailed, you can view Monsoon Magic: Store Every Drop, Grow Every Plant