Jasminum grandiflorum [JAZ-mih-num gran-dih-FLOR-um] is a deciduous shrub, best suited for outdoor use. Jasminum are found throughout Asia, Africa, and the Middle East.
Many assume Jasminum grandiflorum with the common name ‘Spanish Jasmine’ and Jasminum officinale “Poet’s Jasmine” are the same jasmine plants but they are different species.
The spanish jasminum features white flowers with thin petals. Some cultures, use the leaves for herbal medicine and the flowers for the scent of Jasmine in perfumes.
It’s now mostly grown as an ornamental plant. The plant belongs to the flowering plant family Oleaceae.
Jasminum Grandiflorum Care
How Big Does Spanish Jasminum Grow?
The Jasminum grandiflorum grows slowly. It’s a shrub with long, twining stems and vine-like branches. The thin branches sprout with small circular leaves, but the branches remain mostly bare.
It may only reach a height of several feet when grown indoors. It’s not the thickest or largest shrub but makes a great window pot plant.
If grown outdoors, the Spanish Jasmine is recommended for USDA hardiness zones 8 to 10. In temperate areas and climates plants eventually, reach a height of about 8′ feet tall.
Flowering and Fragrance
The flowers grow from the tips of the stems in clusters of three to nine blooms. You should notice a strong, pleasant fragrance from the small white flowers typically blooming in July.
When grown outdoors, the bloom may last through August. Indoors, the flowers may continue into October.
The scent of the Jasmine (spanish) is considered quite lovely. Commercially the plant is grown to produce perfume.
Light and Temperature
If the ground doesn’t freeze during the winter, you can keep the plant outdoors. It should be placed in partial to full sun and looks great surrounded by lower-growing plants.
When grown indoors as a potted plant, this Jasmine needs plenty of natural sunlight. If possible, place it near a south-facing window.
The standard room temperature should provide the ideal environment for year-round growth, which is why the indoor blooms tend to last through the beginning of the fall season.
Watering and Feeding
Make sure you water the plant frequently through the growing season. In the fall, start scaling back the water. In the winter, you can typically get by with watering the plant once every few weeks.
Fertilize with a water-soluble plant food during the spring and summer growing season but avoid fertilize during the winter. Like most plants, it doesn’t need the extra nutrients during the colder months.
Soil and Transplanting
Spanish Jasminum thrives in healthy, rich soil. Use a well-drained soil to help prevent root rot.
When repotting, transplant in the early spring or after it plants finish flowering. Avoid transplanting in the winter or during the middle of the growing season.
Grooming and Maintenance
Most people choose to keep Spanish Jasmine plants trimmed down when grown indoors. After flowering, trim the long stems to the desired length.
Trim back stems on your outdoor plants if you don’t want the flowers growing from the top of an eight-foot stem.
Luckily, this is a slow-growing shrub. You should have plenty of time to trim the plant before it gets too long.
How To Propagate Jasminum Grandiflorum (Poet’s Jasmine)
Use stem cutting for propagation. Take the cuttings in the spring, as this gives the plant plenty of time to recover during the warmer months.
Take cuttings 3″ to 4″ inches in length from the tip or stem. Drip the cutting into a rooting hormone before placing them in small 2″ inch pots containing a propagating soil mix.
Cover the plants with plastic to lock in moisture and then set them in a bright warm area. The cuttings should take root in about four to six weeks.
After the cutting roots, remove the plants from the plastic bag. Wait several days and then transplant the small growths to new 4″ inch pots.
By the following year, the plants may be large enough for transplanting outdoors or into a bigger pot.
Jasminum Pests or Diseases
Like Jasminum officinale, the Jasminum grandiflorum is a robust plant, not toxic or invasive. Aphids are one of the only issues you need to keep an eye on. If you detect aphids, wash them away with soapy water or a Neem oil insecticide.
If the leaves start to fall off early in the year, plants may not be getting enough water. Keep plants watered regularly throughout the spring and summer.
Suggested Grandiflorum Uses
In regions with mild winters, grow grandiflorum outdoors year-round on a trellis.
In colder regions, grow the plant as a potted or container plant. It looks great on its own as an ornamental pot in a window and grown for many years while providing year-round color.