Albert Barnes Commentary Numbers 24:6

"As valleys are they spread forth, As gardens by the river-side, As lign-aloes which Jehovah hath planted, As cedar-trees beside the waters." — Numbers 24:6 (ASV)

As gardens by the river’s side – Balaam’s language reflects the famous artificial gardens along the banks of his own river, the Euphrates.

As the trees of lign aloes which the Lord has planted – The latter words contain an apparent reference to Paradise . The aloe, imported from China and the far distant East, furnished to the ancients one of the most fragrant and precious of spices; compare Psalms 45:8; Proverbs 7:17.

As cedar trees beside the waters – that is, as the noblest of trees branching forth in the most beautiful situations: an image of majestic beauty, as that of the last verse was of rare fecundity.