I want to add color to my shady front yard. Can I plant caladium bulbs now? If so, when will I see the plants come up?

How long will they stay colorful? Must I dig up the bulbs when it gets cold? If so, that's too much trouble. What else could I use for some lively color? I think I'll probably put out some impatiens, but they seem to require a lot of water for them to look nice all summer. Any other ideas? Now I have hostas, hellebores (just 3 small ones planted last fall), 3 pretty heucheras but I think I'll buy some more, some ferns and azaleas but the azaleas have lost their blooms for the year. I really need color but have very little sun.
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