olive trees are dying!
Three weeks ago we purchased 3 arbequina olive trees about 2 years old. They were in 5 gallon vases and now are in soil. We live in Arizona. Gardener who planted them told us to water them once a week with a bucket of water each. When we got the trees they had a couple of brown leaves he said was due to frost, nothing major though. Now all trees have more brown leaves, but I am concerned more about one that has more brown leaves than green now! We did have about a week ago 3 days with frost temperatures in the night around 20 degrees. I asked others and they told me it's unlikely the frost is killing them but lack of water! I was told when they are transferred to soil they need more watering than a bucket a week to establish. The soil was very, very dry so we watered them last night instead of waiting another 4 days. We are expecting another 3 days when the night is expected to go down in the 20 range again. How can I protect them? I touched the brown leaves on 2 trees and they were very crisp and fell off right away. I removed all of these dry dying leaves. The tree in the picture concerns me the most, it's all brown almost, but when I touch the leaves they do not fall off as the other trees. Advice highly appreciated, what can I do? we spent over 200 dollars for these trees!