Edges of leaves on my poinsetta are turning yellow help

Hi Carole.
Clivia yellowing leaves Over-Watering. Clivias develop yellow leaves and root rot if they are over-watered. They grow best when kept barely moist in pots with excellent drainage.Clivias bloom more freely when their roots are crowded, so don't re-pot until the bulb starts to push out of the container.31 Jan 2011

Why Are My Clivia Leaves Turning Yellow? ' Hunker

https://www.hunker.com/12470714/why-are-my-clivia-leaves-turning-yellow Search for: Clivia yellowing leaves

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.
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not sure if this link will help you out.
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try these links for help

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hi.
not sure if this link help help you find out why but have a look.
summer beauty leaves look limp and turning brown at edges Google Search

Replace the YELLOW image unit not toner

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

Over watered im affraid