they are not indoor plants. Generally hardy plants are better grown on in less warm temperatures than the average house. I can't say why they died though. Which ones are they?
OK, just googled and those are pelargoniums, not hardy geraniums. Peth.lad, the naming of these by suppliers has been a problem for years! The only trouble I've had with raising or overwintering pelargoniums indoors is overwatering which can lead to fungal infection.
A trowel in the hand is worth a thousand lost under a bush.
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In the sticks near Peterborough
In the sticks near Peterborough
The only trouble I've had with raising or overwintering pelargoniums indoors is overwatering which can lead to fungal infection.