A hydrothermal vent is a fissure in a planet's surface from which geothermally heated water issues. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins, and hotspots.
When to Set out Tomato Plants. The best time to set out tomato plants is after danger of frost, which is usually anytime in April, May or early June. If you started seed indoors, the seedlings should be about 6 to 8 inches tall and hardened off before transplanting outside.
When to Use Tomato Plant Fertilizers. Tomatoes should be first fertilized when you plant them in the garden. You can then wait until they set fruit to start fertilizing again. After the tomato plants start growing fruit, you can add light fertilizer once every one to two weeks until the first frost kills the plant.hen fertilizing tomato plants after the fruit have set, first make sure that the tomato plant is watered well. If the tomato plant is not watered well before being fertilized, it can take up too much fertilizer and burn the plant.