母樹 is read as ぼじゅ (boju) and means seed tree.
ぼじゅ
boju
ぼたい
womb
ぼかん
mother ship
ぼたいほごほう
Maternal Health Act
ぼけいせい
matriarchy
ぼけいかぞく
matrilineal family
ぼしかんせん
mother-to-child infection
ぼせいいでん
maternal inheritance
ぼしてちょう
maternal and child health notebook
ぼしけんこうてちょう
ぼけい
maternal line
ぼかく
mother nucleus
あもとじ
mother