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The general rule of thumb is to fertilize when the lawn is 50% green. You probably missed your window to put down pre-em to keep weed seeds from germinating but Texas Weed will chime in for that and clear up on the timing issue. You just need pre-em with Dimension. I've seen it at Ace Hardware called Amaze. You will have to use a sprayer to kill weeds on the spot like Weed B Gone. You will have to start mowing at 1 inch with your rotary mower to keep weeds under control so they do not get a chance to produce seeds. They will eventually fade away when the summer hits and bermuda start to thicken up.

You will probably start out with a fertilizer with NPK ratio of 3-1-2 like LESCO 15-5-10 as your first application of the year and use LESCO 39-0-0 every 30-45 days for the rest of growing season. You can get it at LESCO store (go to their website and find out the nearest store by you)

I just mow down wild onion. It doesn't really bother me because my st augustine grass is coarse type and weeds tend to blend in perfectly and barely unnoticeable when mowed regularly. Can't say the same thing for fine bladed type like bermuda though.

1. There is a Lesco dealer at 115 NW Industrial Ct in Bridgeton Mo that will have everything you need and knowledge.

Since you are in MO there is still time to get a pre-emergence down for summer annuals. Look for a product containing Dimension. Since you missed the optimum time for pre-emergence and are now in need of fertilizer, I would recommend one of LescoÂs combo products like Dimension 19-3-6 product code 080382. Not sure of STL soils the local Lesco rep can help you out with that.

After the combo application you will need to use a straight nitrogen product for the rest of the year of 39-0-0 product number 000777. Then next late winter apply a straight Demension product followed by another application 8 to 10 weeks later. Also next spring after the grass is about 50% green start off the season with an application of either a 15-5-10 (500258) or 20-5-10 (016165). After that nitrogen only until September.

2. Too late to do much now except dig it up bulb and all, or you can try to use a very expensive product called IMAGE. You can also try to paint the green shoots with Round UP, but they will come back. Or you can waist your time with something like Weed-be-Gone.

To be honest STL area is really poor area to try to grow Bermuda grass as it will be dormant for 6 months or more of the year. But now that you have it, you are stuck with it unless you are willing to go to great expense to get rid of it and plant a cool season grass this fall.

The onion is a wildflower. I can't remember the name, but it grows up about 4x faster than your regular grass. Whatever happens, DO NOT LET THE FLOWERS GO TO SEED. As I understand it the seed pods explode seed into the surrounding area. My MIL had them and I know they grow fast and furious. I had to pluck the flowers about twice a week while I mowed once a week.

These flowers are members of the lily family and grow from a bulb located about 6-10 inches below the surface. The only way to get rid of them is to kill that bulb or dig it out. In that respect they are a pest like nutgrass. It seems to be that they do go away after the spring, only to return next spring. I had a couple sprouts of that a couple years ago but they seem to be gone now. My care program is to water deep and infrequently and mulch mow tall. I fertilize with organic fertilizer on the major federal holidays. Maybe I am lucky but I see those things in the neighborhood all the time.

If you want to get rid of bermuda, smothering it out is the only way I've seen that had any success. I keep bermuda out of my yard by the tall mowing, but I smothered about 400 square feet last year using a couple inches of sand and couple inches of mulch. There was the occasional sprout or two but they were easy to manage. You absolutely have to get it all out, though. It is aggressive, persistent, and patient.