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I would like to remove an underscore out of my ggplot2 boxplot (the head of fill "fungicide_treatment".

I already tried to change the column head in my excel data file, and I tried already the function labels = ~ gsub("_", " ", .x) in my scale_fill section of my code. The underscore did not go away with these two trials. Maybe I placed the gsub function in the wrong position in my code?

Here my boxplot: enter image description here Here my gglpot2 code in R:

ggplot(df3, aes(x = Drechslera_treatment, y = Abundance, fill=Fungicide_treatment)) + geom_boxplot(lwd=0.1)+ xlab("Drechslera treatment") + ylab("Unidentified fungi abundance / plant")+ scale_fill_manual(values=c("#90EE90", "#228822"))+ theme_linedraw()+theme_bw()+ theme(axis.text.x = element_text(size=07), axis.text.y = element_text(size=14))+ theme(axis.title.x = element_text(size=14, face="bold"), axis.title.y = element_text(size=14, face="bold"))+ facet_grid(, vars(Cultivar))

I would be very thankful for some hints to solve that. Wish you all a good night! Greetings from Munich. Stephan Grassl, Terrestrial Ecology, Munich

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  • The first argument of scale_*() functions is the legend title, which is what you are trying to set. Commented Mar 2, 2024 at 1:04

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One possible solution would be to rename your column with code like this colnames(data)[colnames(data) == "Old_Name"] <- "New_Name" and then use back-ticks when referencing it in your ggplot

So for your data it would be:

colnames(df3)[colnames(df3) == "Fungicide_treatment"] <- "Fungicide treatment" ggplot(df3, aes(x = Drechslera_treatment, y = Abundance, fill=`Fungicide treatment`)) + geom_boxplot(lwd=0.1)+ xlab("Drechslera treatment") + ylab("Unidentified fungi abundance / plant")+ scale_fill_manual(values=c("#90EE90", "#228822"))+ theme_linedraw()+theme_bw()+ theme(axis.text.x = element_text(size=07), axis.text.y = element_text(size=14), axis.title.x = element_text(size=14, face="bold"), axis.title.y = element_text(size=14, face="bold"))+ facet_grid(, vars(Cultivar))

Alternatively, as suggested in the comment by mikeck you can change the legend title using the scale_fill_manual() function like so:

ggplot(df3, aes(x = Drechslera_treatment, y = Abundance, fill=Fungicide_treatment)) + geom_boxplot(lwd=0.1)+ xlab("Drechslera treatment") + ylab("Unidentified fungi abundance / plant")+ scale_fill_manual("Fungicide treatment", values=c("#90EE90", "#228822"))+ #simply add your legend title here theme_linedraw()+theme_bw()+ theme(axis.text.x = element_text(size=07), axis.text.y = element_text(size=14), axis.title.x = element_text(size=14, face="bold"), axis.title.y = element_text(size=14, face="bold"))+ facet_grid(, vars(Cultivar))
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Dear promicrobial, hey, both your solutions did work perfectly! Large amounts of thanks to you. We tested the effect of fungicides on endophytic bacteria and fungi in barley. It´s my first paper, so I am not so experienced yet. But I hope that I can help you as well someday! All the best, Stephan

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