Also known as marigolds, these plants are a popular choice that can be used in many different ways.
The flowers are used as companion plants to help deter pests away from fruit or vegetable plants, as well as adding color into any bed or container.
They were once commonly used as an insect repellent. There are different types of marigold which use the name Tagetes, usually either French or African marigolds.
These plants are very easy to grow, even from seed, preferring full sunlight and well-draining soil. They are a cornerstone of butterfly gardens, as many caterpillars use it as a food plant.
Some varieties are perennials, and some are annuals. Most Tagetes are hardy in USDA zones 1 through to 11.
Callistephus chinensis, or the Tartarian aster, comes from the daisy family.
While it looks like a regular aster at first glance, it’s distantly related, and the Callistephus genus only features the species named above.
It is a perennial plant native to Korea and China. In recent years it has been introduced into Europe as an ornamental garden plant.
It grows up to 100cm tall with pale blue flower heads in late summer and early fall.
This plant needs a sunny position in well-draining soil in order to do well.
Rosa x odorata, also called the tea rose, comes from the Rosaceae family. It is one of the most popular cut flowers around the world.
This plant was originally cultivated for its fragrant blooms during the 19th century, with the scent being similar to Chinese black tea, hence the name, tea rose.
These are repeat flowering, blooming in pale pink, yellow, orange, and white.
The roses themselves are interesting, being nodding blooms thanks to the weak flower stems, and the petals are arranged in a loose spiral, curving in on itself at the edges.
Tea roses do well in any type of soil, as long as it drains well, and they can soak up as many of the sun’s rays as possible.
Once mature, tea roses will get to a maximum of 4 feet tall.
Texas Mountain Laurel
The Texas mountain laurel, also known as Dermatophyllum secundiflorum, belongs to the Fabaceae family, and you can see the resemblance in the flowers, which look like those of a sweet pea.
This tree is native to southwest parts of North America and Mexico.
It’s a slow growing plant, eventually reaching 15 feet tall if space and growing conditions allow.
This evergreen will survive drought with no problems, as well as lots of moisture and rainfall.
The tree really comes into its own in spring, when it explodes into color, producing rich purple flowers which are heavily scented, and the fragrance has been compared to grape soda.
One thing to note, however. The Texas mountain laurel is extremely poisonous, and eating just one seed from the tree can kill you.
Thunbergias come from the Acanthacea family. These vines and shrubs are grown across the world for their striking flowers.
Thunbergii like full sunlight, well-draining soil, and support if you choose a vining variety. They require a sheltered position, away from frosts and wind.
Freezing temperatures are likely to kill the plant, so grow vining types up a sheltered support such as a summerhouse or the side of your house.
They’re usually planted with other flowering plants to provide contrast, color and height into any garden.
The flowers are typically bright colors, such as reds, pinks, purples, yellows, and whites.
Thunbergii are easy to grow, and once established, they’ll flower for years to come.
Tickseed, calliopsis, or coreopsis belong to the Asteraceae family, related to daisies, sunflowers, and chrysanthemums.
These perennials produce flowers in shades of golden yellow, sometimes speckled with red or orange.
Tickseeds need full sun, and will withstand very dry, hot areas, but could do with some afternoon shade in the summer.
They are perfect for rockeries, containers, or anywhere with well-draining soil.
Tickseed can reach up to 45cm high, introducing varying heights and colors into any border. They also make great cut flowers.
Tiger flowers, or Tigridia, belong to the Iris plant family, and you can see the resemblance in their showy flowers.
These perennial bulbs produce dramatic flowers that bloom in late summer for just a few weeks.
They prefer well-draining soil, either in a position of full sunlight or partial sun.
Tiger flowers are not only beautiful, but also highly fragrant.
Their blooms only last for around a day each, but the good news is that one stalk can produce several blooms.
Tiger Flowers are half-hardy, and can tolerate most climates during the summer, although they thrive best in warmer regions.
These plants are hardy in USDA zones 8 through to 10, and do best at the front of a border or part of a container planting scheme.
They also make great cut flowers.
Tiger lilies, or Lilium lancifolium, belong to the Liliaceae family.
This bulbous perennial produces large orange flowers, and some hybrids have been created to produce yellow, white, or red flowers.
It’s native to China, Japan, Korea, and parts of Russia, and does best in a sunny spot with rich, moist soil.
Tiger lilies will flower year after year in USDA zones 3 through to 9. They do well in pots or tubs, and can be used as a focal point in mixed borders or beds.
Tiger lilies can reach anywhere between 2 and 5 feet tall, depending on the growing conditions and the variety you choose.
Grown as bright annuals in many parts of the world, these flowers attract pollinators like a magnet, as they contain plenty of nectar, which is sure to benefit the rest of the plants in your garden.
They also attract other useful insects which help to keep pest numbers low.
Some will get just under 2 meters tall, depending on the growing conditions, and all produce bright orange or red flowers which look a little like sunflowers.
They are nearly always grown from seed, as these plants are easy to raise, and don’t require much care.
They are also available as plug or adult plants, but this is more expensive.
Tithonia is ideal for use as an accent in a bed or border, and can even be planted in pots if you prefer. They need full sunlight and soil with good drainage.
The name ‘toad lily’ comes from the attractive speckles on the plant’s flowers and foliage, which resemble those you might find on a toad.
They are part of the lily plant family, in the Tricyrtis genus, and come from Asia, including the Philippines, Taiwan, and Japan.
These perennials have creeping rhizomes, and grow naturally in shade, whether that’s partial or full shade. They also love a lot of moisture, and will weather sudden drops of temperature without any problem.
Toad lilies come in shades of green, white, purple, and yellow, with contrasting spots on the flowers, sometimes the leaves, too.
Most reach between 2 and 3 feet tall when they are mature, and flower in summer.
Most toad lilies are hardy in USDA zones 4 through to 8.
Part of the Campanula family, there are around 3 species of trachelium.
These lovely plants mainly come from the Mediterranean, native to places such as Morocco, Portugal, and Spain.
Most are very easy to grow, reaching about 120cm tall, featuring violet-blue flowers in the summer, as a tender perennial.
In colder areas, this plant is treated as an annual, only planted out when all risk of frost has passed, providing rich color during summer.
Trillium, also known as birthroot, birthwort, the tri flower, wakerobin, or toadshade, comes from the bunchflower plant family, Melanthiaceae (see also The Trillium Genus).
These striking plants come from parts of North America and Asia, as perennial herbs which grow in woodland areas.
You can recognize them easily, as they produce three sepals, three petals, and three leaves per plant. Flowers come in shades of white, deep red, pink, green and yellow.
Some species bloom very early in spring, while others appear in summer. The foliage can be solid green, or it can feature silvery speckles.
It’s worth pointing out that some species of trillium are protected, so you need to be careful where you get them from. Always make sure to get protected plants – or any plants, really – from a reputable seller, even if you’re only buying seeds.
Trillium prefers loamy soil with plenty of drainage, and indirect light, or a position in shade.
The plant may not flower for the first year, and it completely dies back during winter, to re-emerge in spring.
This genus of flowering plants belongs to the asparagus plant family. It includes 16 species of perennials, found across western parts of North America.
Triteleia is also known as the triplet lily, as every part of the flowers are produced in threes.
They flower during the last few weeks of spring, well into early summer.
These perennials aren’t frost hardy, so they will either need to be planted once the frost has passed in spring, or in early fall with other spring bloomers such as tulips.
Triplet lilies need at least partial sunlight for most of the day in soil which has decent drainage. To get the best out of triplet lilies, plant them in nutrient-rich, organic soil.
A member of the Iris plant family, these beautiful plants are often used as ground cover in rockeries or other freely-draining sites such as containers, sandy soil, or rocky borders.
They cannot grow in acidic soil.
Also known as the flame freesia, this perennial produces cup-shaped blooms in bright shades of orange during spring.
Flame freesias require full sunlight in order to survive, in a sheltered area. If you live somewhere cold, you may need to grow them under glass or in a conservatory, away from cold temperatures.
Trollius, or the globe flower, comes from cooler parts of the Northern Hemisphere, with about 30 different species to choose from.
These plants come from the Ranunculus or buttercup family, and the majority are perennials.
These are poisonous plants, so they aren’t a good option for gardens which see pets or children.
Most trollius plants like a lot of moisture, in well-draining soil, in a sunny position.
They’re hardy plants in USDA zones 3 through to 8, and get to a maximum height of 3 feet tall.
Globe flowers make a great addition to cutting flower gardens, as well as mixed borders, providing sunny blooms in shades of orange and yellow.
Tree peonies (see also Peony Types And Varieties) are members of the peony plant family, and are grown worldwide, thanks to their fantastic blooms.
They have been cultivated since ancient times, and there are many varieties to choose from.
Most will flower in late spring or early summer, and can reach 5 feet tall after about 10 years or so. They need plenty of space, both for the parts of the plant that stay above the ground, and for the roots to anchor themselves properly.
These peonies will lose their foliage during winter, but the plant’s woody stems won’t die back like herbaceous peonies, allowing for some winter structure in your garden.
Tree peonies grow well in USDA zones 4 through to 9, requiring deep, well-draining soil, away from larger plants such as trees or shrubs.
They require a sheltered position, away from direct sunlight, strong winds, and hard frosts.
These are truly beautiful plants which are capable of living for over fifty years, treating you to a real display year after year.
The tuberose is a very popular cut flower, thanks to its fragrance (used in perfumery), and color.
It belongs to the Asparagaceae plant family, and is native to Mexico, now grown across the world.
If you plant it during early spring once the risk of frost has passed, this plant will treat you to heavily-perfumed flowers in the height of summer.
If you live in USDA zones 7, 8 through to 10, you can safely leave your tuberose in the ground all year round without worrying about frost.
If you live somewhere cooler, you will need to dig up and overwinter your tuberose before frost can kill it.
Alternatively, you can grow a tuberose as a summer annual. To make the most of the scent, plant them in containers near windows, doors, or seating areas to enjoy the best of these flowers.
The flowers form on a spike, which can reach up to a meter high, always producing bright white flowers, which have a waxy texture.
The plant is very easy to propagate, as it readily produces offsets.
In colder climates, it’s worth starting these plants off indoors in winter, gradually acclimating them outdoors once the risk of frost is over.
Depending on when you move them outside, they might not flower until September.
There are hundreds of different tulips available, which emerge from bulbs in spring, with each type having its own unique characteristics.
Some types produce large single flowers, while others produce clusters of smaller blossoms.
This makes choosing one difficult, as there are so many different varieties to choose from, and new cultivars are being created all the time.
Part of the lily family, most tulips flower during the early spring.
This is an easy plant to grow, and requires little maintenance once it is settled into the soil, flowering reliably year after year.
You can grow them in beds, rockeries, containers, and borders, and some tulips will spread over time.
They grow best in a position of full sunlight in well-draining soil, and some varieties will grow in very light shade.
One thing you do need to get right is the timing of when you should plant tulips. In order to flower in spring, they need to be planted in autumn when the bulb is dormant.