I don’t have experience grafting citrus indoors/potted but hopefully its not too different. In my short experience, the most important factors for takes are rootstock flushing, freshness of the scions and weather in that order. For outside, I need to contend with protecting the grafts with foil and batting earwigs that want to nest in it at the same time, but that shouldn’t be a problem for you. For grafting, I found methods with more cambium contact like W/T or bark produced better success than cleft.
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