Question
I bought a yucca tree from wal-mart a couple.months ago ad I'm having wharf time figuring out it I'm over watering not watering enough or if it has a disease. Leaves are drooping turning brown curling and the tips are dieing.

Answer
Dear Sean, Brown curling leaves on a yucca is never a good sign.  You are probably underwatering this plant.  You don't mention what state you live in, or whether the plant is in a container or in the ground, and how much sun it is currently getting, so let me walk you through a few things to get you and your yucca in a healthier place.  Basically, you can plant this in a container, or you can plant it in the ground.  I prefer ground when possible because they are able to spread out as much as they need.  They need to be in as sunny a location as you have.  It doesn't necessarily have to be all day sun, but it wouldn't hurt.  Usually when a plant turns brown on the tips of the leaves, it is a problem associated with underwatering.  Since you bought this plant recently, if it is in the ground it will take a full year to become well established.  During this period it will need much more water than the plant will need later in order to set out good roots.  I would water about every two days until it starts cooling off in your region, but keep up the water when the plant is dry well into next year.  As a general rule of thumb, I would water the yucca when the top two inches of soil is dry.  This will help your plant become much better situated in its place.  Water the plant from the ground, not on the plant itself to avoid any fungal situation.  And if you start getting black spots on your leaves along with the tip browning, then your foliage is getting too wet.  I would trim off any obviously ruined foliage, and then spray the plant with a good fungicide with the active ingredient Chlorothalonil or Proprioconozole. Be sure to keep the bad foliage cleared off and removed from the ground to avoid reinfection.  These are my favorites of the good fungicides, and if you spray about twice with either of these, you should clear up any spotting.  I hope this information helps you, but please write back if you have more questions.  I promise to be much more prompt with my reply. Give the plant a lot more watering and see if you have a lot of improvement. Good luck, Melissa