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.
For cooler areas, February is a great time to sow your tomatoes and peppers. Start drawing out your garden for all the vegetables you want to grow. In late February there are several cool weather vegetables you can directly sow out in the garden. February is a great time to try a Garden Shot! Broccoli.