I am trying to use seaborn.stripplot() to do categorical plots as shown below using the reproducible code:
import seaborn as sns
df = sns.load_dataset('iris')
sns.stripplot(data = df,
x="species", y="sepal_length",
color = 'red',jitter=False,zorder=3, marker='X')
But when I use 'x' or '+' or '_' and other non-filled markers as a marker it is returning nothing, why so?

