Hallgrimur

Sphagnum has long been recommended as a method for starting seedlings but it also had one serious fault. The rootlets of seedlings form with such a sod that it was impossible to remove them without serious root injury. A medium that would not become soddy was needed. Vermiculite partially met this need but it too had a fault.

With repeated wetting and drying it tended to “slake down” and become waterlogged. Before the seedlings were ready for the garden the volume of vermiculite might have been reduced to one half of its original volume and have lost the granular texture so important for good growth. Something was still lacking!

A new product made of lava rock expanded by heat and called perlite appeared on the market. This was stable, it did not slake, it was easily shaken from the rootlets of the seedlings, it had everything, except that it did not produce good seedlings in many cases. Grown in pure perlite, seedlings tended to be chlorotic, growth was slow and seedlings lacked substance.

After a period of trial, a combination of the three, sphagnum, perlite and vermiculite, was found that has proven an excellent medium for germinating seed and starting cuttings. Used at the rate of one part sphagnum and two parts each of perlite and vermiculite it was a medium that would not become “soddy,” would not slake down and would shake from seedlings with minimum root injury.

This mixture has proved excellent for starting seeds of all kinds, from the dustlike seeds of begonia and African violet to the big seeds of nasturtium. Sphagnum increases the stability of the mixture and is necessary. for the very fine seeded species, but may be omitted when larger seeds are sown. For plants that produce big, husky seedlings, disturbance of the surface of the medium during watering is not serious, but to the tiny seedlings of begonia and violet, it may be fatal.

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