A box and whisker plot is a graphical method of displaying variation in a set of data. In most cases a histogram provides a sufficient display; however, a box and whisker plot can provide additional detail while allowing multiple sets of data to be displayed in the same graph. Some types are called box and whisker plots with outliers.
Can you compost Leylandii branches and hedge clippings - Yes. We were quite surprised to learn some experienced composters advise not to add Leyandii cuttings as they are apparently too acidic. Composting bacteria can remain active in all but the most acidic conditions.
This is because comfrey is perhaps the most efficient of all British plants at sucking up nutrients. Its deep roots - 10ft or more - take in all available goodness and store it in the large, hairy leaves. When cut, these break down very fast, so transferring the nutrients back into the soil. I like the specificity of this - the comfrey is tapping into the unique brew of this garden's nutrients and then releasing it back to plants also growing in this precise soil. I use comfrey in three ways. The first is simply to add it to the compost heap, where its nutrients will both enrich the whole heap and encourage decomposition. Comfrey has a high carbon to nitrogen ratio - ideal for most plants. The second way is to spread the leaves as a mulch beneath, say, your tomatoes.