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).
The best time to prune most shrubs is when they are. dormant. Just prior to bud break in March or April. is the best time, although it can be done anytime. during the dormant season (late fall to early spring). When pruned at the proper time, the cuts readily. seal over and new growth quickly arises. If done.