The question here should be, "Why do my plants always die when I go on vacation?" Here are some solutions from Real Simple.

Question:
Do you have a solution for watering plants while you're away?

Answer:
# If you'll be gone for more than a weekend: Give plants a thorough soaking before you leave. Move plants out of direct sunlight, and group them together in one cool, medium-light area to cut back on their water needs.

# If you'll be gone for four to five days or more: Try DriWater Gel Pacs ($2 each, www.driwater.com for store locations) or Water Maid Wicks (available at plant stores, or $2.50 for five, 800-343-8114, ext. 20). You can also use a very long cotton shoestring. Soak it in water until saturated. Water the plant thoroughly, then place one end of the shoestring into the soil at least an inch deep, making sure the soil and the string have good contact. Place the other end in a 16- to 32-ounce container filled with clean water, making sure to keep the flowerpot at a lower level than the water. The water will slowly wick into the soil as it dries out and keep the plant moist for a week or two. For large plants, use more than shoestring or wick.

# Terra-cotta cones can also help plants get plenty of water. These nifty devices consist of a cylinder with a cork ring on top. Push the top of the cone into the mouth of a plastic soda bottle filled with water. Invert the cone and the bottle and place the cone into the soil of your plant. The terra-cotta will absorb the water from the bottle and release it slowly into the soil. Terra-cotta cones cost $12.50 for three and can be found at Gardener's Supply Company (www.gardeners.com).