Norfolk Pine dying!

[ddepiet at aol.com]

I have a Norfolk Pine of much sentimental value....my kids gave it to me 6
years ago for a promotion ...has lived peacefully in my offi ce for many
years...about 4' tall now...usually I put it outside in the summer
although this year I didn't...It didn't grow in the summer like it usually
does when I put it out.  Now the lower branches are starting to die.  What
to do?  I areated the soil.  
Some Miracle Grow?  
Dan DePietropaolo of Wilmington, DE....DDepiet