Crocuses and Iris reticulata usually start to fade at about the same time where I am @Fairygirl, there's only a matter of days apart, but that does depend on the varieties planted.
I'd wait until both species have faded and then remove them all to give the tulips more space @mchua. You'll get a better show from the tulips and they won't be competing for light and water. There won't be any annoying fading leaves to spoil your display either!
Yes - the variety is very relevant. If anything, the Irises tend to finish before most crocus here, but it just depends on the type. I grow the Joan of Arc crocus, which is also much later than all the others, so that could be a better option with the little Irises for getting more of a succession. It's the reason I don't do the lasagne thing. Easier to have single species in a pot, and you can plant much more heavily and get a better display. Just shift pots around as one lot fades, and saves a lot of faffing
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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I'd wait until both species have faded and then remove them all to give the tulips more space @mchua. You'll get a better show from the tulips and they won't be competing for light and water. There won't be any annoying fading leaves to spoil your display either!
I grow the Joan of Arc crocus, which is also much later than all the others, so that could be a better option with the little Irises for getting more of a succession.
It's the reason I don't do the lasagne thing. Easier to have single species in a pot, and you can plant much more heavily and get a better display. Just shift pots around as one lot fades, and saves a lot of faffing
I live in west central Scotland - not where that photo is...