Are 5-10 gallon non drought-tolerant citrus trees eligible?”
The 5-10 gallon trees would be outside the requirements of the announcement. These can be proposed in your project application but submit a reason on why these smaller sizes are desirable (including a reference). In addition, these smaller trees are likely less expensive as 15-gallon containers. One of the considerations when reviewing the proposals is the cost and number trees per amount requested. So please also include the cost differences between these tree sizes so this may be taken into consideration.
