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    <p>An alternative following your original <code>text</code> expression:</p> <pre><code>par(mar=c(6, 4.1, 4.1, 2.1)) labels &lt;- paste(c("RB-GL830-[16]-10", "RB-GL830-[16]-30", "SB-GL834-[11]-10", "SB-GL834-[11]-30", "RB-GL843-[17]-10", "RB-GL843-[17]-30")) boxplot(count ~ spray, data = InsectSprays, col = "lightgray", xaxt = "n", xlab = "") # x axis with ticks but without labels axis(1, labels = FALSE) # Plot x labs at default x position text(x = seq_along(labels), y = par("usr")[3] - 1, srt = 45, adj = 1, labels = labels, xpd = TRUE) </code></pre> <p>Why use <code>x = seq_along(labels)</code> for label positions? The <code>x</code> in <code>text</code> is a vector of coordinates where to put the labels. If you look at <code>?boxplot</code>, you find that the <code>at</code> argument is a "numeric vector giving the locations where the boxplots should be drawn [...]; defaults to 1:n where n is the number of boxes." Because we haven't specified the <code>at</code> argument in the <code>boxplot</code> call, the default "1:n positions" will be used. The number of boxes is of course the number of levels of your explanatory variable, which @Josh O'Brien used in his answer. To show you an alternative, I used your customized label vector instead (which of course must have the same length as the number of factor levels). <code>seq_along</code> generates a regular sequence from 1 to <code>length</code> of the argument, which corresponds to the "defaults to 1:n" <code>at</code> positions.</p> <p>A side-note: your data seem to be in a 'wide' format. In many instances in R, it is more convenient to have the data in a 'long' format. In the <code>plot</code> function, you then only need to specify your x variable (e.g. location) and y variable (e.g. soil temp), instead of specifying data for every single level of x. <img src="https://i.stack.imgur.com/onzGE.png" alt="enter image description here"></p>
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    1. COThanks Henrik! worked out perfectly
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    2. COGreat to hear that @samjam! Please see my little side-note regarding the format of your data in my updated answer.
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