beejakshara mantra Baba's Yogic powers

This is from Shri Sai Satcharita (in Chapter 5) regarding Baba's yogic powers and neem tree's greatness.

Sada Nimbavrikshasya mooladhiwasaat,
Sudhastravinam tiktamapiapriyam tam,
Tarum Kalpavrikshadhikam sadhayantam
Namameeshwaram Sadgurum Sai Natham

I bow to Lord Sai Nath, who by his constant stay at the foot of the Neem tree, made, it - which though bitter and unpleasant was yet oozing nectar(Amrut) on account of its healing properties, better than the Kalpavruksha(wish fulfilling tree)