Garden carpeted with celandines. Should I spray and when?
Celandines are pretty but very invasive.
You can dig up the the plants, though if it is a large area this may be nearly impossible.
Changing the soil conditions can have an impact. They love a damp and clay soil so improving the soil by adding drainage and adding well draining loamy soil can help discourage the plant.
In the most drastic method you can use a herbicide on the plants though this will likely kill off everything in the area.
How to kill weeds in the lawn?
Identifying the types of weeds that are growing in your yard is key, so that you use the correct control method. These articles may help you get started, and then also see our individual articles on different weeds: https://www.gardeningknowhow.com/plant-problems/weeds/
https://www.gardeningknowhow.com/plant-problems/weeds/weed-control.htm
I have a lot of little trees in my garden - coming up 4-6 inches. How do I kill them without killing the plants by them? I have hundreds throughout my gardens. Please help!
Here is an article that will help you:
https://www.gardeningknowhow.com/ornamental/trees/tgen/weed-trees.htm
I'm a new home owner. Huge garden to take care of. I cut down the tall grasses last fall. Now, I suspect that a prolific weed has taken root in the tall grasses. The leaves don't look like they are "grassy." See pic. If they are weeds, have I lost these grasses? Is there any way to save them? I believe previous owners used an herbicide in their sprinkler system to help keep weeds down.
Before planting, to kill the weeds and grasses on the ground, can I spray Round-up?
Hand pulling weeds is the most safe and natural way to remove the weeds.
Chemical control is an option, and the links below will help you with this option.
Remember to use the chemicals according to all package directions.
https://www.gardeningknowhow.com/garden-how-to/info/overgrown-landscape-beds.htm
https://www.gardeningknowhow.com/plant-problems/weeds/glyphosate-information.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-long-does-weed-killer-last-in-the-soil.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-gardening-for-beginners.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/raised-vegetable-gardens.htm
Which side up? Shiny or matte?
You should always follow the instructions on the packaging, and if you have additional questions about the use of the product, call the manufacturer or check their website for additional information (phone # and website are usually shown on the packaging). Once you've contacted the manufacturer, this article may also help you:
https://www.gardeningknowhow.com/plant-problems/weeds/weed-barriers-in-gardens.htm
What is the black material that covers the ground that I see throughout central Florida. I presume it is used for weed control?
I'm a bit unclear on the type of material that you are referencing.
Here is a link about the use of landscaping material, often used as a weed barrier in home gardens.
https://www.gardeningknowhow.com/plant-problems/weeds/weed-barriers-in-gardens.htm