Oxalis regnellii Green, also known as the Shamrock Plant, is indeed reminiscent of St. Patrick's Day with its vibrant green foliage. It's a popular choice for adding a touch of green to indoor spaces during the holiday.

However, it's important to note that Oxalis plants can be sensitive to shipping stress, as you mentioned. Their leaves might close up during transit, which can initially appear concerning. But with proper care and acclimation, they usually recover quickly.

How to care for your Oxalis 

Water:  If possible water from the bottom, using a saucer, once a week, and mist over the leaves every few days.

Light: They enjoy bright but indirect sunlight.

Humidity: Regular humidity levels.

Temperature: They enjoy warmth, about 20 degrees C but can tolerate lower.

Other info - 

Pot size: 12cm

Toxic to cats & dogs? Yes