I'm going on vacation for a week and some plants need watering often. Read up on two watering products - which one is better, the Aqua Globe or Plantastic?
Certified GKH Gardening Expert
These articles may be helpful: https://www.gardeningknowhow.com/houseplants/hpgen/while-youre-away-vacation-care-for-houseplants.htm
A thorough watering just before departing should be enough. If you don't feel this would be adequate, either product would provide additional moisture.
I have one tomato plant in 5 gallon pot. mammoth sunflower and grape tomato in a (3.5 X 1 X 6) estimated numbers box herbs and smaller potted plants will give to people to care for the week. other plants will last until I get back.
There are too many variables to answer your question. What plants, how large and how much sun do they get? Could you get someone to water once while you are away?