Kittens can have catnip. Most of them will not do anything with it until they are somewhere between three and six months old, and that is a developmental delay, not a sign you bought the wrong toy.
The plant is safe. The receptors are not ready. Those are different facts, and mixing them up is how people end up deciding their kitten is "not a catnip cat" at nine weeks.
Why young kittens ignore it
Nepetalactone, the oil in catnip, has to bind to receptors in the nose before anything happens. Those receptors, and the brain's response to them, come online as the kitten approaches sexual maturity. Until then, many kittens treat the smell as uninteresting, and a few treat it as slightly aversive.
The window is rough, not a date:
- Up to about two months: almost no reaction. Some kittens will walk away from it.
- Three to six months: the usual stretch where a responder starts to respond. It can switch on over a few days.
- After six months: if there is still nothing, they are probably in the third of cats that never respond.
If a three-month-old kitten sniffs a toy and leaves, wait a few weeks and try again with fresh herb. One test at twelve weeks tells you almost nothing.
It is also genetic
Even among adult cats, only about two in three respond to catnip. The trait is inherited. A kitten whose parents ignored catnip is more likely to ignore it too, though you cannot read that off a pedigree in any useful way.
So a six-month-old that still does nothing may be a late starter, or may be a non-responder. One more try with clearly fresh, green catnip is worth it. After that, switch plants rather than switching brands of the same plant.
Is it safe?
Yes. Non-toxic, non-addictive. A kitten that eats a large amount of dried leaf may vomit or have loose stools, same as an adult. Do not leave a bowl of loose herb out. A stuffed toy they cannot empty is the better format.
A few kittens get overstimulated and nippier than usual. If that happens, put the toy away and try a shorter session later, or skip catnip until they are older. Play that ends in biting hands is a habit you do not want.
Offer it once or twice a week once they do respond. Daily use is how the smell becomes furniture.
What to do while you wait
Catnip is a bonus, not a developmental need. Kittens that cannot smell it yet still need to hunt, catch, and kick.
Two short play sessions a day, morning and evening, with something they can actually grab. Wand toys to start the chase, then a soft object roughly the length of the kitten from nose to shoulder to finish it. That grab-and-kick is the part a laser pointer cannot provide.
Leave a couple of toys out and keep the rest in a box. Rotate every few days. A floor covered in toys is how you teach a kitten to see toys as clutter.
If they never respond
Silver Vine is the plant to try next. It uses a different set of compounds, mainly nepetalactol and actinidine, and it reaches about 75% of the cats that ignore catnip. Sensitivity to Silver Vine also tends to appear in that same three-to-six-month window, so a very young kitten ignoring both is still not a verdict.
Once they are old enough to test properly, a toy that holds both herbs saves you running the experiment twice. You have no way of knowing which side of the genetic line they will land on, and a single-herb toy is a coin flip.
That is the reason we fill Le Croissant with organic catnip buds and Silver Vine fruit together, at least 30g of it, in reinforced OEKO-TEX cotton. Wait until they are past the three-month mark before you expect a reaction. Before that, the shape still works as a kicker toy. After that, the herbs are there if they turn out to be a responder to either plant.