Does the mug have a drainage hole?

The mug is a decorative planter, and mugs of this kind usually have no drainage hole. Water sparingly and tip out excess, or repot into a container with drainage.

How do I care for a prayer plant?

Give it bright, indirect light, keep the soil evenly moist but not soggy, and keep humidity high. Use filtered or distilled water, since prayer plants are sensitive to minerals and fluoride in tap water.

Why do the leaves fold up at night?

That is normal for prayer plants. The leaves rise in the evening and open in the morning, which is where the name comes from.

Is it safe for cats and dogs?

Maranta prayer plants are generally listed as non-toxic to cats and dogs. Still keep pets from chewing the leaves and check with your vet if you are unsure.

It works as a novelty gift because the mug planter is charming and the plant is small. Keep in mind the recipient needs to water it and provide humidity, so it suits someone who enjoys houseplants.