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here are some safe alternatives that you may find helpful: https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-grass-naturally-kill-unwanted-grass-in-your-yard.htm
https://www.gardeningknowhow.com/special/organic/homemade-pet-friendly-weed-killer.htm

No picture, but I wonder if it's nut grass. Kill it by covering with black plastic, herbicide or pulling it complete. If it's nut grass it does pull easily, but that is not effective unless you get the nut which is sometimes hard unless you loosen the soil in the area.

If it is in your flowerbed and you're worried about killing your other plants, there really is no alternative to carefully digging up each nutsedge plant you see and continuing to do this throughout the season until it is all gone. If you don't mind carefully applying a chemical, Bentazon, Halosulfuron, Imazaquin, or Sulfentrazone should kill it if applied correctly and according to the directions on the package. Virginia Tech gives some guidelines here: http://ext.vt.edu/lawn-garden/turfandgardentips/tips/nutsedge.html

There aren't many ways to kill this off without harming the soil in any way. The least harmful method would have to be pouring boiling water over the grass. This will kill them on contact, while leaving the soil alone, except for killing what it touches at that moment. After this, your native grass will take back over. Just keep applying until there are no more shoots that come up, as they can spread seeds that may lay dormant for awhile. It will just take a little time to kill this off completely.

Alternatively, if you want to get rid of it in one go with a selective herbicide, then you can choose one specifically for this weed. It will not harm other grasses, but there will be residual chemicals left over.

Uh oh- This can be a big problem! There are a few things you can do once you ID the exact nutsedge that you have. This article will help:

https://www.gardeningknowhow.com/plant-problems/weeds/controlling-sedge-weeds.htm

If all else fails, you may need to partner up with your local extension service for help:

https://www.gardeningknowhow.com/extension-search

Nutsedge requires special attention. It is a very aggressive plant that can get out of control if not treated properly.

This article will help you with sedges:

https://www.gardeningknowhow.com/plant-problems/weeds/controlling-sedge-weeds.htm