Sometimes the stem gets plugged with soil so I just keep giggling it until the air bubbles start, but then it will usually put all the water in the plant at once. So I started making a hole for the stem first which seems to work better and there is no soil to plug it up.
each bird can hold about 4oz.
It depends on how much water you have filled into the globes. We have done experiment that half full water could keep watering for about 7-10 days. Apart from the water amount, the watering speed is also decided by the absorbility of soil.results may vary due to different conditions, soil or plant types. It is hard to give you a standard answer. It is suggested to test the speed on your plants before you go out for a long trip. Thanks
HelloIm sorry to hear that, unfortunatelly plastic tubes not sell seperetaly, but bird globes are also useful without plastic tubes,because they only exist for easy use.