
1) Conjoin 2) Engraft 3) Graft 4) Hybridize a shrub 5) Join 
Found on 
https://www.crosswordclues.com/clue/ingraft

1) Engraft 
Found on 
https://www.crosswordclues.com/clue/ingraft

• (v. t.) To subject to the process of grafting; to furnish with grafts or scions; to graft; as, to ingraft a tree. • (v. t.) To insert, as a scion of one tree, shrub, or plant in another for propagation; as, to ingraft a peach scion on a plum tree; figuratively, to insert or introduce in such a way as to make a part of something.Ingraft:...
Found on 
http://thinkexist.com/dictionary/meaning/ingraft/

1. To insert, as a scion of one tree, shrub, or plant in another for propagation; as, to ingraft a peach scion on a plum tree; figuratively, to insert or introduce in such a way as to make a part of something. 'This fellow would ingraft a foreign name Upon our stock.' (Dryden) 'A custom . . . Ingrafted into the monarchy of Rome.' (Burke) ... 2. To ...
Found on 
http://www.encyclo.co.uk/local/20973
In·graft'  transitive verb [ 
 imperfect & past participle   Ingrafted ; 
 present participle & verbal noun   Ingrafting .] [ Written also 
 engraft .] 
 1.  To insert, as a scion of one tree, shrub, or plant in another for propagation;...
Found on 
http://www.encyclo.co.uk/webster/I/59
  No exact match found.