How to gank lanes that are warded
I've seen junglers decide a lane is ungankable the moment they are told it's warded. This leads to frustration for both the jungler who has no confidence in ganking warded lanes and his teammates who want a gank no matter what so I've made a guide on things you can do as a jungler to overcome any troubles you might have with lanes that are warded. Examples are included.
https://www.youtube.com/watch?v=YIpWKc1gV0Y
For those that don't have 3 minutes to spare the summary is as follows. You can use stealth champions like Shaco and Eve to bypass wards. You can use high mobility champions like Hecarim and Rammus to gank a warded lane successfully. You can use champions with cross map ultimates like Nocturne or Pantheon.
Or if you don't want to pick specific champions to overcome wards you can also gank through the lane itself instead of the river. Use any distractions (active fighting) to get passed wards unnoticed before your opponents can react. And lastly understanding that people aren't always watching the wards they've planted so gauge the reactions of your opponents to see if you've been noticed instead of being overly hesitant over the prospect of having been seen.