Bit of Luck they may start to grow.
Mate of mine this Summer drove some 6" diameter posts in his field soaked in a mixture of creosote and sump oil, you've guessed it, at least 50% threw side shoots. Looked impossible, you could smell the creosote 100 yards away .
Didn't last as he rubbed them all off when he spotted them !
My (limited) understanding that board over entrance or snow blocking entrance is the way to go in snowy conditions to stop girls flying to their death from cold as long as they are on OMF with entrance blocked. Interested by your photograph as to why you have a QE below brood box above a super?