If a planet is weak in a natal chart ,like say mars in taurus ,But if this mars is also retrograde in taurus does that mean the ill affect of mars is reduced because it is retrograde here despite mars being weak in this house
Discussion
If a Planet is retrograde it isn't weaker, it means that its energies affect our Soul in a different way than a direct one.
Even if Taurus is Mars' fall Sign, thus debilitating it, it is actually a good placement. It makes you proficient in obtaining money, passionate with your partner, constant and diligent in your affairs and projects (the fixed earth sign of Taurus is a great helper in keeping the flaming energy of Mars under control).
However the retrograde motion can brings some problems like: holding too much back your anger with subsequent rage explosion, poor sexual drive (like Mars in Libra), general lack of vitality.
Active HelperLook into aspects of the Mars as well. Having a planet aspecting it can make it's effects completely other than explained above.