title: How to change pandas DataFrame.plot fontsize of xlabel?
body: <p>I'm trying to plot a figure by pandas.</p>
  
  <p>The font of other text could be set. </p>
  
  <p>But xlabel couldn't be set. ax3 couldn't use axes.set_xlabel() parameter. </p>
  
  <p>I also try ax.set_fontsize() or plt.rcParams.update({'font.size': 22}). It doesn't work.</p>
  
  <pre><code>    plt.figure()
      ax1 = df_plot.plot(x='wind_direct',y=plot_columns,figsize=(30,18),linewidth=5,kind='line',legend=True, fontsize=16)
      ax1.legend(loc=2,fontsize=20)
      ax1.set_ylabel('kw',fontdict={'fontsize':24})
  
      ax2 = ax1.twinx()
      ax3 = df_plot.plot(x='wind_direct',y=counts_columns,figsize=(30,18),kind='bar',legend=True, ax=ax2, fontsize=16)
      ax3.set_title(title,pad=20, fontdict={'fontsize':24})
      ax3.set_ylabel('counts',fontdict={'fontsize':24})
      #ax3.set_fontsize(24)
      plt.rcParams.update({'font.size': 22})
      ax3.legend(loc=1,fontsize=20);
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/aI7Jm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/aI7Jm.png" alt="enter image description here"></a></p>