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.
Instead, short-day and intermediate-day onions are best for us, and we can plant them twice a year: in late October or November for a late-spring harvest, and in spring for a late-summer crop. Fall planting, however, yields more robust bulbs. The earlier you plant, the bigger theyâll get. The Cycle.