Are you looking to grow some flowers that start with O? There are a variety of options to choose from and I have found all of them and put them together on one page for you.
Are you looking for something colorful or edible? Do you want a garden plant or a house plant? The options are all here for you to choose from. So, without wasting any more time, let’s take a look at the best flowers that start with O.
1. Orchid
Orchids are some of the most popular (and breathtaking) flowers that start with O. They belong to the Asteraceae family and are native to the Mediterranean and Rome which is known through portrayals of them in ancient works of art.
Orchids come in a variety of enchanting colors including red, pink, blue, orange, yellow, green, and white. They grow to be about 1 foot tall and a few inches wide. Orchids are without a doubt one of my favorite plants and one of the best houseplants that start with O.
- Water: Once per week in the winter and once per week in the summer
- Soil PH: 5.5-6.5
- Sun: Full sun, but not in direct sunlight
2. Oriental Poppy
The Oriental Poppy, also known as Papaver orientale, belongs to the Papaveraceae family. It is native to northern Iran, the Caucasus, and northeastern Turkey. This poppy is one of the most beautiful flowers that start with O due to its vibrant colors and the uniqueness of the flower itself.
They have bright flowers, hairy foliage and are truly a sight to behold. They come in colors of peach, purple, red, pink, salmon, maroon, and orange. The only downside is that the plant is toxic to humans and animals. So, be sure to look at it and not eat it!
- Water: 1 inch of water weekly
- Soil PH: 6.5 to 7.0
- Sun: Full sun or partial shade
3. Oregano
Oregano is one of the most delicious plants that start with O. Similarly to mint and sage it belongs to the Lamiaceae family. Oregano has many uses including its diverse range of health benefits and its ability to turn a bland dish into a flavorful dish.
It is green in color and has flowers at the top when it grows, but is usually grounded to fine leaves when used as a spice or medicine. Oregano is a natural antibiotic. It also lowers cholesterol, relieves pain, and has anti-inflammatory properties. What an amazing plant!
- Water: Water when the soil feels dry
- Soil PH: 6.5 and 7.0
- Sun: Full sun to partial shade
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4. Orange Daylily
The orange daylily is an ornamental plant that belongs to the Asphodelaceae family. It is native to the Himalayas, Korea, Japan, Caucasus east, and China.
This is another one of the beautiful flowers that start with O due to the flowers’ long curved petals and bright green foliage. As the name states, the flower only comes in the color orange, but it is a spectacular pale shade of orange that is definitely noteworthy.
Also, it comes with a variety of health benefits. Since the orange daylily is an edible plant, its buds are a source of vitamin C, vitamin A, and protein. This means that the flower is great for immune boosting and it is great for your eyes and energy levels.
- Water: Water a few times per week for one month and then once per week
- Soil PH: 6-7
- Sun: Full sun
5. Ornamental Onion
The Ornamental Onion, also known as Allium, is a flowering plant that belongs to the Amaryllidaceae family. It is native to the mountain regions of the Northern Hemisphere and is most likely to be found in drier areas.
Unfortunately, these flowers aren’t edible and you cannot add them to your cooking. However, they are a great addition to your garden and will add that extra spark of life.
Also, when you crush them, Ornamental onions have an onion-like smell. They grow to be 1-4 feet tall and are some of the most exquisite flowers that start with O.
- Water: One inch of water per week
- Soil PH: 5.5- 6.5
- Sun: Full sun
6. Ox-eye Daisy
The Ox-eye daisy is a flowering plant that belongs to the Asteraceae family. It has been introduced to Australia, New Zealand, and North America, but is native to Europe.
The Ox-eye Daisy is one of the more gentle flowers that start with O. It has soothing white petals and a deep, yellow center that is enough to put anyone at ease.
It grows to be 24 to 30 inches in height and blooms from the middle of spring until the end of June. This flower is truly a graceful sight to behold.
- Water: One to two inches of water every week
- Soil PH: 6.5-7.0
- Sun: Full sun
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7. Osteospermum
Osteospermum, also known as the African Daisy, is another one of the flowers that start with O that belongs to the Asteraceae family. The flower is native to Southern Africa which is where it received its name.
Osteospermum comes in a variety of colors including yellow, blue, and purple which is one of the elements that makes the flower so beautiful.
It blooms through Spring, Summer, and Autumn and grows to be roughly 20 inches in height. Symbolically, Osteospermum represents loyal love.
So, if anyone ever gives you one of these flowers, you can rest assured that you have stolen their heart.
- Water: Water regularly and do not let the soil dry out, but do not overwater.
- Soil PH: 5.5 to 6.5
- Sun: Full sun
8. Oyster Plant
The oyster plant is also known as “Moses-in-the-cradle” and similarly to spiderworts, it belongs to the Commelinaceae family. It is native to southern Mexico, Guatemala, and Belize and is one of the best houseplants that start with O.
The plant itself is toxic when eaten and can cause a burning sensation in your throat, but in some parts of the world, once the plant has matured it is used for its medicinal benefits.
Some of these benefits include preventing hair loss, enhancing your immune system, protecting your heart, strengthening your nervous system, relieving muscle pain, and making your muscles stronger.
- Water: Water if the top 2 inches of the soil is dry
- Soil PH: Acidic
- Sun: Fun sun- partial sun
9. Obedient Plant
The obedient plant is a flowering plant that, similarly to mint, belongs to the Lamiaceae family. The plant’s flowers bloom from the last month of summer until the first month of fall and have white and pink flowers with blue and green foliage.
The obedient plant is one of the best plants that start with O to grow because of how quickly and easily it grows. It is native to North America and is often used as perennial borders or for low-maintenance plantings.
Some other uses for the obedient plant include using them for Mass Planting or Rain Gardens. Lastly, the plant is quite tall and grows to be roughly 3-8 feet tall.
- Water: Water once a month in spring, summer, and fall
- Soil PH: 5.5 to 6.3
- Sun: Full sun – partial shade
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10. Ohio Spiderwort
Ohio Spiderwort is a perennial plant that is native to Ohio as the name states. It is also another one of the flowers that start with O that belongs to the Commelinaceae family.
The flowers come in a variety of spectacular colors including rose, white and blue. They bloom from late spring to mid-summer and reach up to 3 feet in length making them reasonably tall flowers.
Ohio spiderwort isn’t only easy on the eyes. In fact, it is one of the most useful plants that start with O. You can use it for kidney problems, insect bites, digestive problems, and cancer if you mix it with the right ingredients.
- Water: Water once per week
- Soil PH: 5.0 to 6.0
- Sun: Partial shade – partial sun
11. Oriental Lily
If you’re looking for the most fragrant flowers that start with O, you’ve come to the right place! The Oriental Lily is known for its fragrant aromas and belongs to the Liliaceae family along with the rest of the lilies.
The Oriental Lily, however, is seen as a hybrid and comes in colors of pink and red or white. Oriental Lilies are different from Asiatic Lilies, primarily because Oriental Lilies bloom later than normal lilies.
These lilies bloom from the end of summer to the beginning of fall, whereas Asiatic Lilies bloom at the beginning of spring. Also, Oriental Lilies are native to Japan.
- Water: 1 inch of water per week
- Soil PH: 6.5 – 7.0
- Sun: Full sun- partial shade
12. Obovate Peony
The Obovate Peony is a perennial plant that belongs to the Paeoniaceae family. It is native to Japan, Siberia, China, and Manchuria.
The flowers bloom in mid-spring, but since peonies only bloom for 7-10 days, you may want to schedule your holidays and time accordingly so that you don’t miss out on the wondrous spectacle.
Also, the Obovate Peony grows between 18 to 24 inches in length which makes it a reasonably tall flower. The flowers come in a variety of striking colors including white, bright red, and pink.
- Water: 1 inch of water per week
- Soil PH: 6.1-7
- Sun: Full sun
13. Oxblood Lily
If you’re looking for one of the most beautiful flowers that start with O, you have just found it. The Oxblood Lily is a flower that belongs to the Amaryllidaceae family.
It is native to Uruguay and Argentina and was also introduced to Texas. The Oxblood Lily has a vibrant, blood-red color which is where it got its name.
It grows up to 13 inches tall and is roughly 1 inch in diameter. The flower usually symbolizes love and passion which makes it a great gift for Valentines Day.
Also, the Oxblood Lily has the unique trait of going dormant throughout the summer, so be sure to schedule your time to watch it bloom in the autumn.
- Water: Needs very little water. Water only as needed
- Soil PH: 6.0 to 6.5
- Sun: Full sun
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14. Okra
Here’s one for the foodies out there! Okra is one of the tastiest plants that start with O and it comes with a multitude of nutritional benefits.
It belongs to the Malvaceae family and is native to Western Africa and Southeast Asia. On an Okra plant, you’ll find smallish, seed pods that are green in color.
This is where all of the deliciousness can be found. The pods contain vitamins, minerals, fiber, and antioxidants that are great for your body.
Also, Okra contains Magnesium and may reduce your risk of obtaining cancer or heart disease. The Okra plant usually grows between 3 to 6 feet in length and is absolutely tantalizing.
- Water: Water deeply every 7-10 days
- Soil PH: 6.0 and 6.8
- Sun: Full sun
15. Oleander
Oleander is a shrub that belongs to the Apocynaceae family. It is also one of the more popular flowers that start with O and is native to the Mediterranean and North Africa.
Unfortunately, this is an extremely toxic plant, and consuming a single leaf can be lethal to a child. So, it’s best to be safe rather than sorry when working with this plant and to make sure that no one that you are with ( including yourself) consumes any part of the oleander.
Other than its toxicity, it is quite a beautiful shrub. It has soft, pink flowers and green foliage. The shrub grows to be between 8 to 12 feet tall which is quite big for a plant.
- Water: 1-2 inches of water every week while it is in the growing process
- Soil PH: 5.0 to 8.3
- Sun: Full sun to partial shade
16. Opuntia
I’ve got another one here that the food lovers will enjoy! Opuntia, also known as the Prickly Pear, is a type of cactus that bears edible fruit. It is native to the Americas but has been introduced to other parts of the globe where the term has become familiar.
Opuntia belongs to the Cactaceae family. It can be identified by its large, flat, oval-shaped leaves and egg-shaped fruit that sits at the top of the cactus.
The fruit has a wide range of medical benefits. It is often used to relieve hangovers, treat high cholesterol, and treat diabetes. It also has antioxidant and anti-inflammatory properties which makes it a super-fruit.
- Water: Water every 2-4 weeks (first year only) then twice a month during summertime and once a month during other seasons.
- Soil PH: 6 to 7.5
- Sun: Full sun
17. Onion
And last, but certainly not the least, we get to the marvelous onion. The onion is also one of the most famous plants that start with O and it’s a delicious one too!
It belongs to the Amaryllidaceae family and is native to Central Asia, Iran, and western Pakistan. The onion is, by far, one of my favorite items on this list, not only because of how yummy it tastes but also because of its nutritional value and health benefits.
For starters, onions act as anti-inflammatories and they help reduce cholesterol. They are also a good anti-oxidant and all of this combined is a great recipe for preventing heart disease. Why not grow your own medicine?
- Water: Roughly 1 inch of water per week
- Soil PH: 6.0 to 7.0
- Sun: Full sun
Conclusion
So, are you ready to grow some flowers that start with O? Grab your shovels and gloves because the world is your oyster when it comes to gardening.
There are so many flowers to choose from. Whether you want edible flowers or ornamental flowers, or perhaps some herbs or vegetables the choice is yours.
PS: Don’t forget to check out this mind-blowing article about magnificent flowers that start with M!
