If you can get Weed-b-Gon Chickweed, Clover, and Oxalis Killer, spray that immediately. Give it 3 weeks to knock down all the broadleaf weeds. If you can't get WBG CCOK, then get regular WBG for bermuda lawns.

You should not expect much from the bermuda up against your walls. It needs more sunlight and walls usually block sun for half the day.

If you don't mind a possible renovation next month, you could spray an atrazine product. It will take out the poa, seeds and all. It might damage the bermuda, but...it is bermuda, and it will return. Atrazine will kill all those weeds. Here's the one I use.

If you look for herbicides with purple labels, those usually have atrazine. Read the label 3 times before you spray. I spray walking backwards so I don't have to walk through the stuff. Remember it is a foliar mist, NOT a soil drench.

For most people mid April is the time to spray herbicide, but you're on Arizona time. Your weeds have matured to the point where they can be knocked out.

If you spray the atrazine and lose some bermuda, write back and we can help you get it back.

I would recommend never overseeding bermuda with rye. The rye does exactly what these weeds are doing. It blocks the sunlight from reaching the dormant bermuda. You should have bermuda growing at full steam right now, but it's buried under the weed canopy.

Thank you for your response.

I ordered the recommended WBG product from Amazon. Only one store in the Phoenix Metro carries it according to Ortho and they are about an hour away. They don't have it at the big box stores. The Spectracide product you recommended is not available in AZ.

Once I spray this how long must I wait before I can go through with the weed whacker and remove the canopy so the bermuda can see the light of day?

I'm not concerned with the area next to the walls. I am going to put in a border and turn the south area into beds. That's the area that is really devoid of sun. The shrubs get enough sunlight, and I'll put down some sort of ground covering medium like pea gravel or quarter minus granite. The east and west ends do get sufficient sunlight, except for the NE corner under the Eucalyptus tree. The bermuda can't thrive there despite efforts to prune the tree back. That is a problem for another post.

Should I plan to put down a pre-emergent still this spring or is your thought I need to overseed with some sort of improved Bermuda. I am thinking under that tree I may have to plug something like Celebration for the relative shade tolerance, and if I'm going to do it there I might as well do it throughout the yard.

You might try the online stores for Lowe's and Home Depot for the Spectracide.

For WBG you might mow first to let the sun into the grass. Then spray.

Beds near the walls are perfect.

Pea gravel comes in two varieties. Round and sharp. Here are some examples

The rounded gravel is okay if nobody ever touches it again. If it gets touched, it will flow around and is easily kicked out of its containment area. The sharp gravel interlocks and does not flow. It can get kicked, but usually only one stone will dislodge at a time. The stepping stones in the bottom picture are 1.5 inches high, so that's just over an inch of stones. They never move.

I have a friend in Gilbert. I've been working with him on his lawn for years. He has several dense sissoo trees in his back yard, so he finally went with St Augustine and is very happy. In his front he overseeded with Post Card Bermuda from Seedland. He is very, very happy with that. Near as I can tell the Post Card mix is not available any longer, but could probably be replicated. I'll check with him to see if he knows what the blend was.

I've been hearing about Celebration bermuda for years, but I don't see anyone talking about it in the forums.

Here's a link to the Postcard Brand Blend of bermuda.