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.
How to Grow Tomatoes. Tomatoes are a warm-season annual that grow best when the soil temperature is at least 55Â°F (12Â°C) and the air temperature ranges between 65Â° and 90Â°F (18-32Â°C). Tomatoes require from 50 to more than 90 warm, frost-free days to reach harvest.