Why did Ahron’s Ma'teh staff blossom and produce almonds, as if it became alive? Because Ahron himself was alive and blossoming with the Simcha of being close to Hashem. Closeness to Hashem brings Simcha, as it says: עֹז וְחֶדְוָה בִּמְקֹמוֹ — in His place there is Simcha. It also brings life, as it says: וְאַתֶם הַדְבֵקִים בַה' אֱלֹקֵיכֶם חַיִּים כֻּלְכֶם הַיוֹם — Connection to Hashem brings life.
He is alive, and therefore he blossoms. How did Ahron become close to Hashem? By always appreciating His constant gifts. The almonds symbolize Z'rizus [Kli Yakar] and Z'rizus is an outgrowth of Simcha. [Mesilas Yesharim].
A dead stick coming alive and blossoming symbolizes the P'nimiyus’dike world of Ahron. One who is close to Hashem is Zoche to Nissim; just as Hashem creates “new” creations, so too those who are close to Him are able to bring about Nissim and create Yeshuos. In the blossoming of the stick, a: דּוֹמֵם inanimate object became a: צוֹמֵחַ live plant.
It was similar to Techiyas HaMaisim. The stick was originally part of a live tree, until it eventually lost its moisture and life, and became a stick. Now it became alive again. A Baal Bitachon is similar, as it says: ְוקֵוֹי ה' יַחֲלִּיפּו כֹחַ — Those who hope to Hashem, their strength is constantly renewed. The person who has Bitachon in Hashem is always renewing himself. This is his lifestyle: שֶׁבַע יִּּפוֹל צִַּדיק ָוָקם — He may fall seven times, YET he gets up.