My ostrich ferns started dyeing off thr leaves turn brown and crunchy not the whole plant just certain leaves i try to keep them moist i dont see any bugs

Perhaps this link will help:
https://www.gardenguides.com/12498587-gardenia-plant-with-leaves-turning-brown.html

Yellowing leaves and browned tips, although I am not an expert, seem often to indicate over watering but it is reckoned impossible to over water a spider plant due to the origins of the plant which is a sort of a tropical grass used to warm humid conditions of indirect light..
Perhaps it is being under-watered or positioned in direct light. Water it well each time but allow the soil to dry out between waterings and feed occasionally in the growing season. Misting the leaves might help...

hi Yvonneduchen.
Blooming mandevillas need moist soil that drains well enough to prevent standing water. Too much water can choke the roots so they don't feed the plant adequately. This can cause the leaves to turn yellow. Conversely, too little water can be deadly, starting with yellow leaves that turn brown and drop off the plant.
or try this link.
Yellow Leaves On Mandevilla Reasons For Yellow Mandevilla Leaves
or this one.
dipladenia leaves turning brown Google Search

try these links for help

The Causes and Cures for Poinsettia Leaf Problems

Dealing With Yellowing Leaves On Plants Reasons For Leaves Turning Yellow


Poinsettia Diseases Plant Diseases

Edge of leaves turning yellow

Are Your Houseplant Leaves Getting Brown Tips or Edges My Indoor...

try these links for help with the iris

Irises


Growing Iris

Iris Care


Caring for Your Iris


Growing Iris Iris Care

Plant dieing

try these links for help

Out Door Palm Leaves Turning Brown Bing News

Brown Palm Leaves

What Causes Brown Tips on Plant Leaves


GreenSeasons Why Are My Palm Leaves Changing Color

http://articles.mcall.com/2012-01-20/features/mc-palm-brown-branches-20120120_1_palm-fronds-lady-palm-brown-fronds

https://pallensmith.com/2015/04/23/nine-common-tomato-problems/

More answers to the question

The answer depends upon where you live, but generally that list is a VERY long list - it's easier to try the opposite direction and ask which plants are TOXIC to cats; that list is much smaller.

First, all plants are toxic to cats, humans, horses, etc... if given in too high a dose. The rest of this answer assumes ordinary exposure.

Most food plants are mostly non-toxic to cats, but onions and garlic and similar plants can be highly toxic to them. Most beans are non-toxic to cats, but chocolate beans and coffee beans can be toxic to them.

Most grasses and grains are non-toxic to cats.

But... some cats may show allergic reactions to unexpected plants, so never assume that anything is absolutely non-toxic to all cats - just as you can't assume that anything is absolutely non-toxic to all humans. Some cats may also have a metabolic quirk that renders them unusually sensitive to certain plants not ordinarily considered to be toxic to cats.

In short... since I assume that you're asking about a particular cat, probably one kept indoors, and you want to know what houseplants are safe to keep in the house... try to put together a list of plants YOU would like to have, then search for information on whether each plant on your list is considered to be TOXIC to cats, and cross it off the list if it is. When you've eliminated all the plants from your list that're known to be toxic, try the rest with your cat. If your cat doesn't deveop a health problem, you're probably OK.

Choose a plant with lots of thick leaves and without any brown spots.