just because a plant says "insect repelling" doesn't necessarily mean mosquitoes... plants can only repel certain insects... their essential oils are created to help protect the plant and one of these jobs is repelling harmful insects that are harmful to the plant.... the plant doesn't care about mosquitoes because ... well... for obvious reasons.... they want to repel bugs that eat them... not us.
I make herbal insect sprays and powders and have to use a range of herbs and essential oils to cover different insects.... the only thing I can find that comes pretty close to deterring mosquitoes is pure cat nip essential oil (the safest one) ... citronella essential oil and pennyroyal essential oil.... however, pennyroyal eo is very strong and toxic so not ever to be used where it can be ingested so do not use around pets.... however, the dried herb of pennyroyal can be used around dogs... mix with cedar shavings, it can be used in pillows to deter fleas, etc...
my mosquito sprays involve quite a blend of cedarwood, pennyroyal water (not the essential oil), citronella, catnip, and lavender ... the plants set into your gardens alone will not do much to deter hungry mosquitoes. ...it's not enough essential oils being released into the air.
if you use essential oils, you must learn how to use them properly and at what dilution rates... each one is different and many are not safe around small children or pregnant women....