‘Hard to kill’ garden plants that ‘thrive’ even when forgotten about

Gardening is a much-loved hobby for many, but it’s not without its downsides. It can be disheartening investing hours and a lot of money growing plants only to have them wilt and die. Not all plants are created equal. While it is possible to kill these plants, by choosing some of these ultra vigorous plants that tolerate a wide range of growing conditions, gardeners can be assured that their investment of time and money will continue to bring you pleasure for many growing seasons to come. 

Sheridan Grant, gardening expert at Backyard Boss said: “Regardless, these hard to kill plants are any gardener’s dream. They’re low-maintenance, produce vibrant and eye-catching flowers, and will continue to thrive even if you forget about them. 

“Finally, you’ll be able to sit back and relax, enjoying the flowers and blooms all summer long without getting your hands dirty.”

Here are the top six hard to kill garden plants that can survive all conditions:


Geraniums come in a broad range of flowers and colours and they are ideal for container gardens or filling garden beds.

The expert said: “The plants can grow from 12 to 20 inches tall and can survive drastic temperature shifts. They prefer full sun and moist, well-drained soils, so you don’t have to stress about overwatering or giving the plants too much light.

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“Geraniums are one of the most popular options among gardeners because of their stunning blooms.”

To encourage new growth and continuous flowering, remember to properly deadhead the plants throughout the season. Geraniums can also be grown indoors as houseplants.


Fast-growing and vibrant, sunflowers make an excellent addition to gardens and containers. While gardeners may be familiar with the mustard yellow blooms, they can also find sunflowers in a variety of different colours to suit their outdoor space. 

As the name would suggest, they enjoy full sun, though they can also grow into late summer with regular fertilising and deadheading.

Sheridan explained: “In well-drained soil, sunflowers can grow from four to 12 feet tall. They are also drought-tolerant and perennial varieties will come back year after year. 

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“So, as long as they have the proper light requirements, and well-draining soil, you won’t have to do much to keep these cheerful plants happy.”


Available in a variety of colours, daylilies feature unique and attractive blooms. They thrive in full sunlight and well-drained soil, though they can handle different soil and light conditions and will still grow with very little care.

The gardening pro said: “Daylilies are adaptable and hardy mostly because they can thrive no matter the weather. The plants can grow one to four feet tall and you should avoid planting near trees or shrubs because they will compete for water and nutrients.

“These low-maintenance perennials are perfect for the forgetful gardener and those who want gorgeous blooms without the work.”


With blooms throughout May, June, and August, catmint boasts beautiful purple flowers that are attractive to bees and other beneficial insects. 

The expert said: “Resembling lavender, this hardy perennial thrives in full sunlight and is drought-tolerant, making them the perfect companion plant for daylilies.”


Ideal for container gardens and August planting, snapdragons feature unique and lengthy slender stalks and lip-shaped blooms. They come in a variety of colours and are available as perennials and annuals. The plants are cold-hardy and bloom well into the autumn season.

The plant pro said: “Snapdragons prefer well-drained soil and full sun. With that in mind, they are low-maintenance, making them an easy-to-grow addition to your garden. 

“They also attract pollinators such as bees, butterflies, and hummingbirds, which will help your entire garden thrive.”

Morning glory 

It’s no secret that morning glories are hardy, in fact, they’re often referred to as a weed. 

While the royal purple trumpet-shaped flowers and heart-shaped leaves are easy to love, the plants tend to be invasive and should not be grown in the garden, says Sheridan.

However, the expert noted: “They make a great option for attaching to a trellis or pergola.”

Morning glories grow best in full sun with well-drained soil and they will quickly climb and spread six to 10 feet. As the name would suggest, the blooms appear in the early morning throughout the summer and early autumn. 

They can also survive temperature drops and will continue to flower after the first frost.

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