The fact that it bloomed, and yielded almonds might have made it just a bit larger.
Num 17:5 And it shall come to pass, [that] the man's rod, whom I shall choose, shall blossom: and I will make to cease from me the murmurings of the children of Israel, whereby they murmur against you.
Num 17:6 And Moses spake unto the children of Israel, and every one of their princes gave him a rod apiece, for each prince one, according to their fathers' houses, [even] twelve rods: and the rod of Aaron [was] among their rods.
Num 17:7 And Moses laid up the rods before the LORD in the tabernacle of witness.
Num 17:8 And it came to pass, that on the morrow Moses went into the tabernacle of witness; and, behold, the rod of Aaron for the house of Levi was budded, and brought forth buds, and bloomed blossoms, and yielded almonds.
I was trying to find where Moses put the rod into the ark. The only reference I could find was this:
Hbr 9:4 Which had the golden censer, and the ark of the covenant overlaid round about with gold, wherein [was] the golden pot that had manna, and Aaron's rod that budded, and the tables of the covenant;