I have done both ways, if you plant basal plate down the sprout will start growing in a vertical position after some time. If you plant basal plate vertical, the roots pull it into a better position if not completely horizontal, no effect on plant.

Izhar,

Thanks for your prompt reply. I plan to do two inside pottings. The first I will place the basel plate down. Three weeks later I will do one with the sprout vrtical.

Lefty

You are welcome, I hope your Gladz perform like mine or even better:

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I have a habit of planting too deeply. What is the rule-of-thumb for Glads. How deep?

I plant them 2 inches deep, they tend to pull themselves deeper because when I dig them out, they are 5-6 inches deep in ground..