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The orchid mantis’ legs sport yet another adaptation: Their petal shape and pink-and-white coloration make the insects resemble a moth orchid, camouflage that helps them ambush prey.

But while nursery staff is happy to answer questions from buyers, don’t bring your flagging Trader Joe’s moth orchid to the nursery for a tuneup.

In April, look for many colors of moth orchid, as well as the delicate violet orchid, a pendant-style native orchid with a spill of flowers.

Mr. Hachadourian, the author of the recent how-to book “Orchid Modern,” acknowledges that people are looking to expand beyond the familiar Phalaenopsis, or moth orchid, and suggested two alternatives.

To maintain the blooms of a moth orchid, keep the plant away from drafts and heat sources, place it in bright but indirect light, and soak the roots in tepid water once a week.