Five Star Gift Ideas

That's a great interest! Here are a few gift ideas for your grandpa's hydroponic gardening hobby:

1. Hydroponic Herb Garden Kit: This kit includes all the necessary equipment to grow herbs hydroponically, and it's a great way for your grandpa to try growing different plants.

2. Hydroponic Plant Nutrients: Hydroponic plants require specific nutrients to thrive, so a good quality plant nutrient could be a great gift for your grandpa.

3. Gardening Tools: A new set of high-quality gardening tools will make your grandpa's work easier and more enjoyable.

4. Subscription to a Hydroponics Magazine: There are plenty of magazines dedicated to hydroponic gardening, and reading them can be a great way for your grandpa to stay updated with the latest trends and techniques in hydroponics.

5. Hydroponic Grow Light: In case your grandpa doesn't have a good lighting set up, a hydroponic grow light could be a great gift. This will provide more light for his plants and help increase their growth.

Or you can get him a star map with an important date you share.