but you may find them in commercial soil mixes. If you have planters outside, they subscribe to the same idea as indoor potted plants and should get similar amendments, including perlite ...
Does Perlite make a difference?
CORVALLIS — While you’re battling the winter blues, make your own seed-starting mix and plan for the gardening days ahead.
Many gardeners use the terms “potting mix” and “potting soil” interchangeably ... which helps with drainage. Perlite, a porous white volcanic rock that improves drainage and aeration.
Question: Dear Master Gardeners, can I use my potting soil to start my vegetable seeds this year? I have quite a bit left over since last year.