Rashi on Numbers 17:23/רש"י על במדבר י״ז:כ״ג

1ויצא פרח AND IT BROUGHT FORTH A BLOSSOM — Take this as what it literally implies.

2ציץ is the first stage in the growth of the fruit when the blossom has fallen off.

3ויגמל שקדים AND RIPENED INTO ALMONDS — This means that when the fruit was recognisable as such it could be recognised that they were almonds. The verb has the same meaning as in (Genesis 21:8) “And the child grew ויגמל, and became a full child” (i.e., able to do without its mother’s milk). This expression is frequently used of the fruit of trees, as e.g. (Isaiah 18:5) “And the blossom becometh a ripening (גמל) grape” (cf. Rashi on Genesis 40:10). — But why did it bring forth almonds? Because it is a fruit that blossoms earlier than all other fruits; so, too, the punishment of him who sets himself in opposition to the constituted priesthood comes quickly, just as we find stated in the case of Uzziah (II Chronicles 26:19) “And the leprosy instantly broke out in his forehead”. — Its translation in the Targum is: וכפת שגדין, meaning that it produced a kind of cluster of almonds, knotted together one upon the other (Aramaic כפת denotes “tied”).