Review on Outdoor Solar Ground Lights 6 Pack - Waterproof Landscape Lighting For Garden Yard Walkway Lawn Driveway With Humidity Sensor (Black) by James Cash

Of course, these can be used for any in-ground plant, but they're a lifesaver for tomatoes. I've not had a single cracked tomato thanks to these. Tomatoes crack because they go from too low moisture (wilting) to too much (watering them to revive). These solar lights turn red when the soil is too dry and green when it's good. So every night I look and see what needs more water and give it a top off if red.So far they seem to be very accurate and reliable. I've been using them as indicators exclusively and my garden has been doing its best ever this year, especially the tomatoes. The battery can charge even under the leaves of the plants and lasts well into 2am (haven't been up later to see).I definitely recommend these solar light monitors because they will definitely help you water the right amount and keep your veggies in one piece!