It's all to do with keeping up the pressure – especially when using an oval-shaped rose with the perforated brass plate facing upwards.
Used correctly in this manner the oval rose will give a fine gentle spray, which is perfect for seedlings.
As you begin to spray, gradually increase the angle of the can to the surface being watered so that sufficient water pressure is maintained to force water out of the fine holes in the brass spray plate. If there is not enough pressure, water begins to run across the brass face instead of being sprayed out from it. Gradually this results in water streaming off the end of the rose, giving the impression that the rose is leaking.
Good watering cans – like Haws – are provided with a tall neck to prevent water spilling out when the can is held at a steep angle.
A good tip when watering precious seedlings is to 'get a good spray going' before moving in to spray the seedlings – and to withdraw from spraying as soon as the spray starts to fail – which will happen as the can begins to empty. Top up the can and restart.
For heavier spaying over a more limited area, the oval rose may be fitted to the can with the perforated brass face pointing towards the ground.
If your rose appears not to be working properly follow this checklist.
If your rose still won't work properly it's probably time to buy a new one! Haws produce many varieties of replacement roses for all of our watering cans. Alternatively our Fine As Rain roses are produced to fit most other brands of watering can.