See: (Matthew 13:31-33 )
The Kingdom of Heaven
Takes us to the Kingdom promised (Daniel 2:44a).
God promised that his Kingdom will fill the whole earth (Daniel 2:35b).
In the same way Jesus compared the Kingdom with the largest of garden plants and yeast working all through the dough.
The Insignificant Kingdom
Before the birth of Jesus we read 'In the ... year of ... people the world considered important ... the word of God came ...' (Luke 3:1-2).
The important people listed did not have a clue what God was saying and appear not interested, although they were fanatical about protecting their interests and murdering those who opposed them.
Jesus compared the Kingdom at this point to a small seed.
The Hidden Kingdom
The Jews were looking for a Messiah who would quickly get rid of their oppressors.
Even those with him after his resurrection were still looking for a quick result (Acts 1:6)!
By comparing the Kingdom to a seed growing into a tree which takes months / years or yeast in bread which needs leaving for a few hours was Jesus warning them not to expect the wrong things or timescale?
The story of the church over the last 2,000 years can make depressing reading. Some tell us God always had those who are truly his people and the Kingdom has been advancing, but can often be difficult to see in TV documentaries.
The Benefits of the Kingdom
Branches to perch in speaks to me of places of security for shelter and rest.
Yeast worked though dough speaks to me of bread that is edible, attractive - makes me want to come back for more.