Native to North America, milkweed grows naturally almost everywhere across the country, except for parts of the Pacific Northwest, so it's adept at surviving not only sandy soil, but also the varied weather conditions across the country.
Welwitschia mirabilis: The world's toughest plant.
Pothos. The Pothos plant is the ultimate indestructible plant on the list. It is tough, durable, and is one of the top-performing air purifiers in NASA's indoor air pollution study. Pothos are considered some of the best plants for offices because they can stay green even in very low-light environments.
The list of the hardest plants to take care of varies from gardener to gardener. However, the lists often feature Orchid, Gardenia, Fiddle Leaf Figs, and Boston Fern.
The genus Anthurium derives from the Greek 'Anthos' and 'Oura'. The literal translation of this is 'flowering tail'. The name is appropriate because of the inflorescence.
Kalanchoe integra (Never die); flowers and leaves.
Evergreen flowering perennials will keep their green foliage all year, long after the blooming season is over. Many herbs are particularly known for being great practical flowering plants with evergreen foliage, such as Lavender, Rosemary, and Salvia, among others.
In Afrikaans, the plant is named “tweeblaarkanniedood,” which means “two leaves that cannot die.” The naming is apt: Welwitschia grows only two leaves — and continuously — in a lifetime that can last millenniums.
Daylily. Practically indestructible, daylilies (Hemerocallis) will flower profusely in almost any sunny spot. They're drought-tolerant and insect-resistant and offer a wide range of colors and bicolors.
But no, the agave americana is definitely from Earth. It's also known as a century plant because it only blooms once every 100 years (roughly) and then dies.
Carrion flowers, also known as corpse flowers or stinking flowers, are mimetic flowers that emit an odor that smells like rotting flesh.
Nerium Oleander
You'd probably be shocked to discover that this pretty plant actually has one of the most poisonous flowers in the world. If ingested, it can cause vomiting, diarrhea, seizures, coma or even death. Contact with the plant alone can cause skin irritations.
Amaranth is an extremely colourful outdoor plant with many decorative possibilities. It comes from the Americas, from where it was exported to Europe by the first colonists. The meaning of amaranth is “immortal”, as in the old days is was considered to be a real flower of immortality because of its many benefits.
Smarty Plants has found the Himalayn lily (Cardiocrinum giganteum) that flowers after seven years of growth. Here are photos of the Himalayan lily. After it blooms the plant dies.
Amorphophallus titanum is often called corpse flower because when it blooms, it emits a powerful stench similar to that of rotting meat. This scent, along with the deep-red, meaty color of the open spathe, attracts insect pollinators that feed on dead animals.
One of the most widely-distributed plants in the world, heal-all or self-heal (Prunella vulgaris), is probably so widely distributed because our ancestors found it useful, though modern medicine essentially ignores it.
Hosta 'Invincible' is another of the Paul Aden breeding hosta breakthroughs. The very thick but glossy green foliage makes a unique 40" wide clump so exquisite it almost looks edible. The clump is topped with thick flower stalks ending in equally exquisite, very fragrant, light lavender flowers on 15" scapes...
Succulents
Cacti and succulents are a crowdpleaser when it comes to tough as nails, unkillable indoor plants! Extremely drought-tolerant and available in a variety of species, colours, and shapes, succulents will survive just about any condition thrown at them.