Bulb growing compost?

What is bulb growing compost? Alright, I know what it is used for. How does it differ from other composts? Anyone know?

Is it not more free draining, so the bulb doesn't rot?

I don't know, don't tend to buy specialist compost with the exception of ericaceous (sp). That's for the camellias, azaleas, and blueberry bushes.

You could be right. I have always used a mix of three parts John Innes No2, to one part horticultural vermiculite, and one part Wicks sharp sand. A mix both free draining and water retentive.

Sharp sand is my substitute for horticultural grit. It is much cheaper. I have read that you cannot use it as it could be dredged from tidal waters, and hence high salt content.

However, I tested by washing it, and letting the drained-off water evaporate from its container, and did not find any trace of salt.

ps I use more or less the same mix for ericaceous, but add sawdust and spent coffee grounds to produce the acidity.

Interesting; thanks for that. I don't tend to use the coffee maker much now, and when I did the grounds were as slug repellant.