seedlings and cold weather

[RichR]

Are seedlings of cold-hardy cactus species more vulnerable to the cold than their grown-up counterparts? I have several hundred 1-year-old cacti in my greenhouse, and it might get down to freezing over the next couple of nights.

[iann]

They would be at risk from extended freezes because they don't have the reserves to go for ages without food and water, but one night shouldn't be a problem. At one year old, most species should be large enough to go a whole winter outside with very limited water.

[fathi]

What is the outside temperature?

[greenknight]

Wouldn't hurt to lay some newspaper or something over them, if for no other reason than to keep the sun from hitting them while they're frozen - that can cause damage even to plants that are otherwise hardy.