Another Brussel Sprout Question

According to a couple of web sites, you can remove the bottom leaves once there are sprouts to stimulate sprout development. How big should the sprouts be before you remove the bottom leaves? Mine have just started showing a very small bud in the axils that I'm assuming is the sprout.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.