Depending on the stage of growth you are in, Grobo can last for weeks completely unattended. We will prompt you with instructions when it’s time to trim and top your plants in order to increase your yields. In terms of water, every few weeks you should change the water out to promote better growth. We have made this process extremely easy and it makes a huge different in terms of plant growth. It is possible to skip or delay this to have fully hands off growing, but we wouldn’t recommend it!