Last year my lemon tree was pushed against the window and suffered frost damage. I thought it was lost and cut it right back prior to throwing it out but low and behold it sprouted. Now its three to four fet tall with large healthy leaved but they have a smaller lobe at the base of each leaf rather like a uneven figure 8. Its also developed large inch long spiked on the branches. Is this normal or have I saved a mutation of some kind?