A pet-friendly garden: what to plant, what to avoid, and how pots help

Most of the pet emergencies we hear about from customers did not start with anything dramatic. A puppy chewed a stem while nobody was watching. A cat brushed past a vase of lilies and then groomed itself. Somebody scattered snail bait after the first spring rain and forgot that the dog eats anything that smells sweet. None of it looks like a hazard until it is.

The good news is that a garden safe enough for animals is not a bare or boring garden. We have planted plenty of them here in Centurion, and the ones that work best are usually more interesting than the gardens they replaced, because thinking about height and containment tends to push you towards better design. Here is how we would go about it.

Start with what is already growing

Before you buy a single new plant, walk your garden slowly with a phone in your hand and photograph anything you cannot name. It is a dull hour and it is the most useful hour you will spend. Then check what you found against the ASPCA list of toxic and non-toxic plants, which is searchable by common name and tells you whether a plant is a problem for dogs, for cats, or for both. Our own rundown of the plants most likely to poison a pet in a South African garden covers the ones that come up here again and again.

You will probably find one or two things you would rather not keep. That is normal. Almost every established suburban garden in Gauteng has an azalea under a tree or an oleander along a boundary wall, because they were planted long before anyone thought about the dog.

The plants we would take out first

If we had to choose one plant to remove from a garden with a dog in it, it would be the cycad. The ASPCA lists sago palm along with other cycads and zamias as toxic to dogs, cats and horses, with cycasin as the toxic principle and liver failure and death among the clinical signs. The seeds are the worst part and they are bright, hard, and exactly the size a dog wants to carry around. Cycads are beautiful and they are also the single riskiest thing many of us have growing next to the driveway.

After that we would look hard at oleander, at azalea and rhododendron, at arum lily, and at any true lily if there is a cat in the house. None of these has to leave the property if you have somewhere safe to put it, but none of them belongs in the strip of bed the dog patrols every afternoon either.

Safe planting that still looks good

The list of plants that are not a problem is far longer than the list that is, which is easy to forget when you are reading about poisoning. Rosemary and thyme both appear on the ASPCA non-toxic list, and so do roses and sunflowers. Ornamental grasses give you movement without giving you a hazard. Spekboom, most of the tough indigenous shrubs, and a great many ferns will fill a bed happily.

Our Plant Library is a quick way to see what suits your light and your rainfall before you commit, and if you are choosing between two options, run them through Plant Compare. It saves the drive back to the nursery to swap something you already planted.

Height is the simplest defence

You do not always have to give a plant up. You often just have to put it somewhere a dog cannot reach without effort. A plant sitting in a tall pot on a patio, with a smooth rim and nothing to climb, is functionally out of play for most large dogs. Cats are harder, so height alone is not enough for them, but for dogs it solves most of the problem.

This is where a raised planting scheme earns its keep. Group two or three bigger pots at different heights against a wall, put the plant you are unsure about in the tallest one, and let the ground-level beds carry only the things you know are fine. Our guide to large garden pots goes through how to get the proportions right so a group like that reads as deliberate rather than accidental.

Weight matters more than you think

A plastic pot with a young dog in the vicinity is a temporary arrangement. They go over during play, the soil ends up on the paving, and whatever was growing in it is suddenly at mouth height on the ground. Our pots are hand-cast from our Fibre Concrete Mix, and a filled 500mm pot is heavy enough that a boisterous dog can lean on it, sleep against it and lift a leg on it without moving it a centimetre. That is not a small thing when the point of the exercise is keeping a plant out of reach.

Stand the pot on a set of concrete pot feet so water drains away underneath and the paving stays dry. Wet paving under a pot attracts snails, snails attract bait, and bait is where the trouble starts.

Mulch, bait and the things that are not plants

Cocoa shell mulch smells like chocolate because it is made from cocoa bean shells, and it contains the same methylxanthines that make chocolate dangerous to dogs. Some dogs will eat it straight off the bed. We would not use it in a garden with animals in it, and honestly it does not perform well through a Highveld summer anyway.

Snail bait is the other one. Most of the blue pellets on the shelf contain metaldehyde, and Pet Poison Helpline describes rapid tremors and seizures after ingestion. It is fast and it is serious. Beer in a sunken yoghurt tub does the same job for snails, and a layer of white pebbles around the base of a pot makes the crossing unpleasant for them while it holds moisture in and keeps the soil surface cool. If you want an organic mulch instead, bark works well, and our piece on mulch explains when to use which.

Shade, water and a patch of their own

A Highveld afternoon in January is brutal, and a dog left outside will find shade one way or another, usually by digging a cool hollow in whatever bed has the softest soil. Give them somewhere better. A tree, a run of tall pots along the western fence, or a shade sail over the paving all work, and any of them beats replanting the same bed every spring.

Keep a water bowl in the shade, not in the sun where it goes warm by ten in the morning, and top it up daily during dry spells. If your dog is a digger, sacrifice a corner. A patch of soft lawn dressing worked into a small area, or a sandpit, redirects the behaviour rather than fighting it.

If something does get eaten

Phone your own vet or the nearest after-hours veterinary hospital immediately, and take a piece of the plant with you, roots and leaves and any berries. Identification is half the treatment, and a photograph on your phone is worth more than your best description of a leaf shape. Do not try to make the animal vomit unless a vet has told you to, because with some plants that makes the damage worse on the way back up.

Most of this comes down to putting the right plant in the right place and making sure the wrong plant is somewhere a nose cannot get to. Pots do that work quietly, and a big cast pot will still be doing it in ten years when the puppy has become an old dog who sleeps in its shade. Have a look through our larger pots and pick something with enough weight and height to settle the question for good.

Frequently asked questions

Which plants are most dangerous to dogs in South African gardens?

Cycads and sago palms are the ones we would remove first, because the ASPCA lists them as causing liver failure and death in dogs. Oleander, azalea and arum lily are also serious risks.

Are lilies really that dangerous to cats?

Yes. The ASPCA lists Lilium species as toxic to cats and non-toxic to dogs, with kidney failure as the clinical sign. Pollen and vase water count, so cut lilies indoors are a risk too.

Is bark mulch safe around pets?

Bark mulch is generally fine and it holds moisture well through summer. Cocoa shell mulch is the one to avoid, because it contains the same methylxanthines that make chocolate dangerous to dogs.

How do I stop my dog knocking pots over?

Use pots that are too heavy to move. A filled cast concrete pot will not shift when a dog leans on it, unlike plastic or fibreglass, and pot feet keep the base stable and draining.

What should I do if my pet eats a poisonous plant?

Phone your vet or the nearest after-hours veterinary hospital straight away and take a sample of the plant with you. Do not induce vomiting unless a vet instructs you to.