Look for one containing vermiculite and perlite, sphagnum peat moss, a little ground bark and sand. |
Just be sure to use the gardening-grade perlite rocks and not the finer grade masonry-quality powder. |
I use a mixture of commercial potting mix and compost with extra additions of perlite, bonemeal, and poultry grit. |
These soil mixtures should include sand, peat moss, perlite, vermiculite, and fir bark for adequate drainage. |
If the problem is reoccurring for you, think about switching from a peat-based mix to one that only contains perlite and vermiculite. |
Make a cut below a leaf joint and dip the cutting in hormone rooting powder before inserting it into an open peat-free compost and perlite mix. |