When Earth and Mars are at their theoretically closest point of 54.6 million km, it would take a signal from Earth about 3 minutes to make the journey, and then another 3 minutes for the signals to get back to Earth.
Switchgrass is a hardy, deep-rooted, perennial rhizomatous grass that begins growth in late spring. It can grow up to 2.7 m high, but is typically shorter than big bluestem grass or indiangrass. The leaves are 30â90 cm long, with a prominent midrib.
Sand Dropseed. Sand Dropseed is a warm season, perennial bunch grass that grows to a height of 1 to 2 1/2 feet. Growth starts in mid-spring and plants are mature by mid summer. It is a prolific seed producer and has high drought tolerance, allowing it to take over thin stands of alfalfa or other less greedy grasses.