Miruna, My experience in growing roses in containers is that the new or newer ones have immature root systems, so they do not drink as much water as the more established ones. That is why the potting soil stays moist longer. The older ones with the larger root systems should be drinking it up quicker, and those ones would logically require more water. Do make sure you have lots of drainage holes in the bottom. They also need to be large drainage holes, not little itty-bitty ones. If your holes are too small, or there are not enough of them, you can carefully tip the pot over and get in from the underside to drill new holes, or enlarge the existing ones. This is easier with a helper, who can steady the plant while the other person does the drilling. I think you would need at least 4-6 holes for the size of pots you have, with each hole about 1/4 - 1/3 inches wide. (At least that's how I do it). And make sure the surface your roses are sitting on will drain, that nothing is blocking the holes. Also, I agree with vaporvac, lifting your pots will help you determine how much water is still in the soil. Also, there is the issue of are the plants getting STRONG sun (in that case, they probably need more water). Browning of the leaves would seem to indicate the plant is dry or thirsty. Yellowing can be too much water, however roses can shed leaves naturally, especially on the interior, and this is not necessarily an indication of the watering schedule. I've found that watering is a little bit of a science, and also getting to know your individual roses. Some of mine are voraciously thirsty. Others are more thrifty drinkers. It's like people, or animals, we are all different! Also, if you ever want to post pictures of your plants that you feel might be suffering from watering issues, feel free, that could be helpful. Good luck!
