@WAMcCormick
WAMcCormick said:At what stage of development and in what type soil should new amaryllis seedlings be planted?
Here`s a quote from `Clemson Extension` (college of agriculture)
A tiny bulblet is evident with the formation of the second or third leaf. After a month, a complete liquid fertilizer of about 200 ppm N is recommended, which may be increased to 500 ppm N at 4 months. After 6 months 700 to 800 ppm N is recommended.
(in other words 1/4 through to full strength of recommended dose)
The bulblets will probably need dividing at the 3-5 month stage, again at 10 months, when you can introduce each bulb to its own pot. When dividing them, use a mixture (by volume) of three parts builder's sand, four parts pine bark (soil conditioning grade), and two parts peat moss. Because of their herbaceous roots, the main consideration is large air spaces in the growing medium.