Answer: Sago palms are exceptionally slow growing - usually only 1-2 new fronds per year so as long as your plant looks healthy, there's not much you can do to encourage it to grow faster. That's just the nature of a sago.
Prayer plants have to reach a certain maturity before they will bloom. Again, just exercise some patience.
Lucky bamboo does tend to rot because it is growing in water. You can try cutting off any rotting parts as soon as you notice them. It also helps to thoroughly clean the container, rinse with a diluted bleach solution, rinse with clean water and then put fresh water in the container. Do this about once a month and it should help keep the roots healthy.
Good luck with all your plants!
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