Here is a video of the engine. There are marks on the ball to make it's rotation easier to see. You will notice that at the start I hold the ping-pong ball in my hand very briefly so the liquid nitrogen will boil and start the rotation quickly.
They can be planted in the spring around your last frost date. Gladioli bloom about 90 days (three months) after they sprout in spring, so the bloom time really depends on when you plant them. In warm climates, where they stay in the ground year-round, gladioli bloom anytime from late spring (deep South) to midsummer (middle South).
Sod. You can lay sod any time of the year, although it's best to plant according to the active growing period of the grass species -- mid-to-late spring for warm-season grasses and early spring or early fall for cool-season grasses -- and to avoid laying sod in exceptionally hot and cold temperatures.arm-and Cool-Season Grass Seed. It's too late to plant warm-season grass species when the risk of frost is less than 60 days away in warm climates and less than 90 days away in cooler climates.