You will probably notice it before anyone says a word. Mom's African violets, the pothos over the sink, the fern by the back door, the cactus she never watered and somehow always watered. One Sunday you walk in and the leaves on the windowsill have gone flat and yellow at the tips, and you know nobody has picked up the watering can in a while.
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Plants keep a quiet record. They do not care whether Dad has eaten or whether he has been out of the house. But whoever watered them was keeping a small daily habit that nobody called a job. When that habit stops, the plants are often the first thing in the house to show it.
What the plants are telling you
Do not read one dry plant as a verdict. Plants go thirsty for ordinary reasons: a heater under the window, a sunny week, a pot that has gone hard on top. Look for a pattern instead. Walk the house and list every plant, where it sits, and when you think it last had water. Push a finger two knuckles deep into the soil. Dry all the way down is real thirst. Damp underneath with a dry crust on top is only a surface problem.
Then ask three plain questions. Has the watering stopped in every room, or only in the spots Mom passed on her way to the kitchen? Are dead leaves piling up in the saucers and on the floor, which means nobody has tidied since the last watering? Has the plant that needs turning toward the light been left facing the wall, so it is leaning and pale? If you can answer yes to two of these, the plants are not the problem. They are a report.
What to do tonight
Water only what is dry, and water it the way she did: slowly, until the water runs out the bottom, then empty the saucer so the roots do not sit in it. Do not drown the whole row to make a point. Pull the brown leaves off with clean fingers and leave the rest alone.
Then write a short list on the back of an envelope: the plant, the window, and the day you watered it. That list is the only schedule anyone has right now, so keep it where it can be seen.
Next, ask one question out loud and then let it sit: who would you like watering these now? Give him two honest choices, him or you, and let him pick. If he says he does not want the plants anymore, do not decide that for him tonight. Some daughters take one plant home at a time, and some fathers want to keep every single one. That is a decision for the two of you, not a rescue.
Move the watering can to where he will see it, by the sink or next to the coffee maker, not tucked back in the utility closet. If the plants stay in the same spots they always had, the routine can come back without anyone having to remember it on their own.
Deciding who waters
You have three real choices, and each one has a catch to check before you commit.
Dad waters. This keeps the habit in his hands, which matters. He may need a note on the refrigerator or a reminder on the phone. Check that he can carry a full can without straining. Some of Mom's pots are heavy when wet, and a tray with a rim is easier to carry than a big jug.
You water on your visits. This works if you come at least once a week and can keep the list up to date. Check your own calendar for a work trip or a bad week, because a plant that goes dry while you are away will show it fast. If a neighbor or a regular visitor is willing to take one or two plants, put it on paper so everyone knows which plant is whose.
A hired non-medical caregiver waters as part of the visit. Watering can be a household chore in the agreement, but only if it is written down. Read the plan before you sign. Check whether watering is named, which plants it covers, and what happens if a visit is skipped. If it is not in writing, it will not happen reliably.
When to ask the doctor
Plants do not belong in a doctor's appointment, but what you see around them might. If the dry plants are part of a wider pattern, such as mail piling up, dishes left out, lights left off all day, or him saying he has no appetite, tell his doctor in plain words what you have noticed and roughly when it started. Bring a short written list. You do not need to name a cause, and you should not try to. The doctor can take it from there.
Ask for an earlier visit if the pattern is new and steady rather than one rough week. Do not wait for a crisis before you mention it.
The good-week card
Add this line to your card: the windowsill has a watering list someone can read, and the plants are green enough that you can tell which one needs help.