I usually don't have to water bigger containers every day until it starts staying in the 80's or have lots of growth and wind and warm. The top part of the soil should be getting dryer before you water. Many herbs can't handle wet feet. How long have your various plants been in their containers and how big are they? What kind of mix are they growing in. These would be questions I would want answered before I tried to diagnose any further. I would (guess) you are overwatering but need more info to know for sure. Dig down the side of the pot and see how wet/dry/ moist it is. Moist is good. Dry several inches down or wet is not good.
Hope this is of some help.
Happy Growing David

If you are watering the way you say that you are, then you may be underwatering.

With each watering that you give your plants, the entire soil volume should be filled with fresh, oxygen-rich water. The excess should drain out rapidly. Little sips encourage shallow rooting, even the death of roots, hard and dry pockets of potting medium, and a build up of dissolved fertilizer salts.

How often your watering cycles should occur will depend upon the size of the plants in ratio to the container, temperature, texture of the potting mix, kind of plant, humidity, wind, and other factors. It might be once a week! Only you can be the judge.

Remember, roots have to have oxygen in order to keep growing. Don't be tempted to keep the soil soggy.

I'll try to describe what I've got:

2 24" long x 6" deep plastic window boxes with 6 Everbearing Strawberry plants (3 in each container), been in about 3 weeks. These were started plants I picked up from Home Depot.

1 24" long x 6" deep plastic window box with a bunch of sugar snap peas. These were started as seeds in early march and are all 1" tall.

1 24" long x 6" deep plastic window box with a bunch of spinach. These were also started as seeds in mid march and a 1" tall.

1 24" long x 6" deep plastic window box with 1 thyme plant, 1 rosemary plant, and 1 chive plant. All bought at Home Depot as started plants.

2 8"x8" clay pots with basil, and 1 8"x8" clay pot with oregano. Bought at home depot as a started plant.

1 3gal plastic pot with a Blueberry Bush

2 3gal plastic pots that are empty - plan to put one mini red cherry tomato in one and one mini yellow cherry tomoato in the other.

All planted in Scotts Potting Soil

you might be right about overwatering - i just watered like I usually do, then waited a minute and poked my finger up through the bottom hole in one of the 8x8 pots and it was dry. So then I watered again until, like you said, excess drained out.

all of your small plants 1" need a good drink then should be a few days til they need watering again. A deeper watering like Rhizo will do wonders, then as the top part of the soil dries then you may water again. I use the weight method a lot in my nursery until I have a feel for a given plants needs. Heavy after watering to (water comes out bottom holes). Light means time for watering again. There really is an art to watering well and many folks just want a schedule and this doesn't work well because the temps, wind and sun/clouds are continually in a mode of change. The potting media also effects how much water is held and for how long. A faster draining media is almost always going to result in better grwoth of most plants. Exceptions such as bog plants and aquatic plants that tolerate wet feet.
I would suggest spending a hour or two reading the container soil threads and you will glean much about successful container growing. I have used scotts potting soil so I can't offer an opinion on how much water it tends to hold and for how long your watering cycles might need to be.
Hope this gets you a little closer to understanding the challenges of container growing but also the great joy as it all comes together. With understanding containers allow all kinds of possibilities that you don't have with soil growing.
I wish you luck and don't be bashful about asking questions and practicing and observing what happens closely and you be an old hand at it. Rome wasn't built in a day and great gardeners make lots of mistakes along the way. Learning from our mistakes is one of the greatest human talents.
Happy Growing David

The rosemary will likely outgrow the window box long before the chives and thyme will. Before it gets too big you might move it to its own container. Just a thought based on years of growing rosemary.
Happy Grwoing David

I typed those last two postings too fast. Sorry, I have not used Scotts potting soil so I am not sure of its compostition. I think most the rest of my typos can be understood even tho it was sloppy writing sorry:(
Happy Growing David

I think I have been over watering some plants too. I first noticed white spots about the size of a dime on the first set of leaves of my hyacinth bean vine. Then saw them on my cup and saucer vine plants. The bottom leaves on some are drooping a bit. They are all planted in Al's mix. So they drain good. But since I put a wick in each of the six inch pots, I thought I could water alot. But the wick removes the PWT not all the water. So I guess if I'm right I should let these pots dry out before watering again. It's the only thing I can Come up with to explain the white on the leaves. I'm I right? Thanks Filix.

Sorry, I don't know but I wanted to pass on my last years discovery.

I started using Miracle Gro "nursery select" or something like that. Orange bag. It was more expensive than the green&yellow bag, but it said that it helps prevent underwatering AND overwatering! I thought that was pretty cool. I'm sure I've done both from time to time. One less thing to worry about!

You may want to try it out. I plan on shopping around this year to see where I can get it at the best price. Some of the garden centers are really not the greatest on pricing. And thats the only place I've seen it.

Thanks wendyb. I will keep a lookout for it. filix

I will have to look at the nursery select labeling tomorrow when I get to work (we carry it at our store). I can't help but be skeptical that any fertilizer is going to help under or overwatering by itself to any significant degree. About the only thing I can think of is adding hydrogen peroxide for the extra oxygen molecule. I will look into it and see if it makes any sense to me. I am not saying it is not possible but it does seem a stretch at least to me personally.
Happy Growing David