source: CBM FightClub, Marvel.wikia, DC.wikia, Comicvine,com
Superhuman Strength: Solomon Grundy possesses tremendous strength and stamina, the level of which varies with his different incarnations. Sometimes, he can be held by a group of normal humans. On other occasions, even Superman has not been able to defeat him.
Superhuman Stamina: Grundy can perform physically strenuous tasks for an indeterminate period of time before tiring.
Mystical Invulnerability: The weird elemental energy that imbues his form with pseudo-life makes him virtually indestructible - he is impervious to bullets, fire, and extreme cold, and can survive indefinitely without food, water, or oxygen.  The only thing that has ever been able to hurt him was the Mist's special toxins, developed to take out Grundy's plant tissue body.
Resurrection: Even when he is destroyed, he has always been reborn sooner or later. The soul of Cyrus Gold enjoys his pseudo-life through Grundy, even though Gold's whole personality is never present in Grundy's "life." Grundy's personality differs from incarnation to incarnation, but he seems to retain some memories of his experiences from one time to the next.
Energy Absorption/Manipulation: Grundy has also proven to be able to absorb certain forms of energy and manipulate them at will. This ability has always been subconscious to the point of being accidental, though, but it would suggest that Grundy is even more powerful than he has the intelligence to realize.
Chlorokinesis: The version of Grundy that ended up on the blue planet gained normal human intelligence, and made contact with The Green, thereby being able to control the planet's plant life. In the Solomon Grundy series, Grundy has been seen resisting the mind control kiss that Poison Ivy uses on people. In addition, he is able to kill all plant life that he touches. Grundy also possess some type of poison that he gave to Poison Ivy through a kiss. It seems she was just knocked out by the poison.
Class 100+; Assumed to be on par with Superman's and sometimes even surpassing him in strength. Grundy's upper strength levels have fluctuated depending upon his present incarnation. However, he can still lift 100 tons with minimal effort. Grundy has been strong enough to crush the Green Lantern Alan Scott's lantern into pieces, and in other incarnations fight the Justice League on brute strength alone.
Low Intelligence: Grundy's below average intellect makes him easy to fool and manipulate. Share on facebook Follow me on twitter Okay Savvy-"G"s, Glorious Geekcreds to the first five individuals to leave geeky comments below.