Taking Care of and Growing Nemesia

Taking Care of and Growing Nemesia

Taking Care of and Growing Nemesia.
Taking Care of and Growing Nemesia.

Taking Care of and Growing Nemesia.

More than fifty different species are included in the Nemesia genus, the vast majority of which are indigenous to South Africa; however, only a select selection of these species are grown commercially as garden plants and given the cultivar name. N. strumosa and N. caerulea are the two species of Nepenthes that are collected the most often.

The N. strumosa1 plant is a true annual that may grow to a height of one foot, bears flowers that are one inch in diameter and can be either blue or white, and blooms for one month. N. caerulea2 is a fragile perennial that may grow up to two feet tall and has blooms that are one half of an inch in diameter and come in a variety of colors,

including purple, pink, blue, and white. Even more commonplace as garden plants are the hybrid forms generated from several Nemesia species being crossed with the other.

The leaves of nemesia plants are in the form of lances, and they are arranged in pairs along the stems of the plant. The blooms of nemesia plants resemble those of snapdragons in that they are tubular and have two-lipped sepals.

As long as the temperatures do not rise too high, this plant will be able to produce an abundance of blossoms, which will, from spring until autumn, nearly completely cover the view of the leaves. Although it is most often planted in the garden as a ready-to-grow nursery plant in the spring, it is very simple to cultivate from seed.

Gardeners who live in areas with chilly winters have the option of either sowing their seeds straight into the garden for summer blooming or starting their seeds inside for early blossoming. In regions where winters are mild, it is common practice for gardeners to sow seeds straight into the soil in the autumn. This helps ensure blooming throughout the winter.

Nemesia Care

When purchasing seedlings from a nursery, search for seedlings that have a large number of flower buds but just a few fully opened blooms. Because Nemesia does not perform well in the process of being transplanted, it is best to choose plants that have not yet begun blooming.

This will limit the amount of stress the plants experience. If you are going to grow them from seed, you should start them seven or eight weeks before the day when the final frost is projected to occur.

When there is no longer any risk of frost, seedlings or nursery starts that have been potted should be transplanted into the garden at a distance of between four and six inches.

Pick a spot in the garden that receives dappled sunlight and has soil that is both rich and wet. Make sure there is enough space for water to drain away.

The application of a layer of organic mulch over the soil will help insulate the roots from any temperature extremes and will also assist in the soil’s ability to retain moisture. After your nemesia plants have become well-established in the garden, they won’t need much attention beyond the occasional watering that will help maintain a moist soil environment.


Nemesia will grow more successfully in full sunshine; nevertheless, it is possible that these plants may bloom for a longer period of time (especially in warmer areas) if they are provided with some afternoon shade.


Nemesias need a soil that is wet yet has enough drainage, in addition to having a high concentration of organic matter. Sand, vermiculite, or perlite may be added to soil in order to increase its drainage, although perlite is the most effective option.

Normal commercial potting mix that has been enhanced with sand, vermiculite, or perlite may be used successfully for growing plants in containers.


Be mindful of overwatering the soil while growing these flowers since it is essential to maintain the soil wet but you do not want to drown the plants. The stems will decay if they are given an excessive amount of water.

Temperature and Relative Humidity in the Area

When temperatures are lower, Nemesia will produce the most lush and healthy growth. In regions that experience summers with temperatures that are not as extreme, you can anticipate them to bloom from late spring until the first frost of the year.

On the other hand, in regions that experience hotter summers, you can expect them to look their best in the early spring or fall, while experiencing some degree of wilting during the hottest months of the year. In climates without winter frost, many perennials may be grown successfully as annuals throughout the winter months.

Even while Nemesia doesn’t mind excessive humidity, it may be more vulnerable to powdery mildew and root rot in highly humid regions. If the conditions for its growth, such as cold temperatures and low humidity, are satisfied, it does quite well in these environments.


A single application of a well-balanced, slow-release fertilizer should be given to these plants in the spring. Alternatively, you might go with a water-soluble fertilizer that can be spread on the plants twice a month when they are in a growth phase while they are actively producing new growth.

Different categories of Nemesia

When choosing nemesia plants, you will have the option of purchasing either pure species plants or hybrid cultivars, as follows:

The cultivar known as Nemesia caerulea ‘Sea Mist’ is a thick mat-forming variety that may reach a height of around 45 centimeters. Late in the spring into the autumn is when its blossoms, which are a light purple color, are in bloom.

Compact dwarf plants with an upright growth habit may be seen within the Nemesia strumosa ‘Carnival’ population. The petals of the blooms have various hues, including yellow, purple, orange, pink, and white.

One of the species that gave rise to a significant number of the identified hybrid cultivars is the N. strumosa species. You should go for N. strumosa ‘Blue Gem’ if you want flowers that are a genuine blue hue, and N. strumosa ‘Triumph’ if you want blooms that are a bi-color.

There is a broad selection of color options available for the Nemesia versicolor, some of which include yellow, blue, white, and lilac. The well-known cultivar known as “Compacta” contains blooms that are both white and blue in color. Many of the hybrid cultivars include N. versicolor as one of their parent species, and it is also one of their parent species.

The blooms of the Nemesia cheiranthus ‘Shooting Stars’ are uncommon and exotic, and they are yellow. They have long, white spurs.

The Nemesia floribunda plant may reach a height of 12 to 24 inches and has fragrant white flowers with yellow throats.

There are a number of common hybrids that are often referred to together as nemesia, including:

The blooms of the variety known as ‘Berries and Cream’ are a tricolor combination of mauve, purple, and white. The growth pattern is that of a trailing habit. It is a low-maintenance plant that has a robust growth habit and blooms all summer long and well into the autumn.

The flowers of the ‘Ice Pink’ cultivar are a pale pink in color. It has a low profile and an upright growth habit, reaching a maximum height of around eight inches and a width of about ten inches when fully mature.

The blooms of the cultivar known as ‘Rhubarb and Custard’ are a rare bicolor, displaying both yellow and purple hues. It is a bigger plant than other cultivars, reaching a height of around 20 inches and a width of approximately 10 inches, and it is reputed to have stronger resistance to heat than most cultivars.

The ‘Sunshine’ rose features blooms that are a brilliant shade of yellow and bloom continuously from spring through October. The growing style is erect, and the plants reach a height of around 12 inches while also expanding in width.

The blooms of the cultivar known as ‘Tropical’ are a combination of orange and dark pink. The height of the plants ranges between 10 and 14 inches, and they have an upright growth habit.

The blooms of the variety known as ‘Wisley Vanilla’ are snowy white, but their centers are yellow. These are bushy, upright plants that reach a height of around 18 inches and a width of approximately 18 inches. They exude an odor that is very strong.

The ‘Aromatica True Blue’ variety features fragrant blooms that are a light blue color and grow on stems that are 14 inches long.

The ‘Opal Innocence’ variety has bloomed with a lilac-gray coloration and grows on plants that are 8 inches wide and with stems that are 16 inches long. Spring and autumn, when temperatures are typically cooler, are the optimum times for it to blossom.

Nemesia ‘Sunsatia Cranberry’ is a trailing variety of plant that has vivid red blooms and stems that may trail for up to 36 inches. It is an excellent choice for hanging baskets.

The cultivar known as ‘Bluebird’ has dainty, blue flowers and is hardy enough to survive the summer’s scorching temperatures.

The cultivar known as ‘Juicy Fruits® Kumquat’ is able to tolerate the high temperatures of summer without the need for deadheading and produces big flowers in shades of gold, orange, and cherry red.


Flowers should have their spent blooms removed as soon as they have finished blooming in order to encourage new bud growth. If you are growing the plants as annuals, you should remove them from the garden after they have finished blooming and their leaves have faded away.

If you are planting a perennial variety in an area that is suited for plant growth, you should prune the plants so that they are as short as possible in preparation for winter.

Propagating Nemesia

Growing Nemesia from seed is not very difficult (for more information, see the “Growing Nemesia from Seed” section below), but the plant may also be simply reproduced by cutting stems and rooting them:

In the latter part of the summer, take cuttings that are between four and six inches long from the stalks that do not produce flowers.

The ends of the cuttings should be dipped in rooting hormone before being planted in tiny pots that are filled with commercial potting mix that has been gently wet.

After enclosing the container in a plastic bag and placing it in an area with room temperature, you should wait until the cutting has developed roots before removing it. If you find that condensation is forming on the plastic surface of the bag from the inside, you should open it up to let in some fresh air.

After the cutting has developed roots, the pot should be taken out of the plastic and the plant should be moved to an area where it will get enough of sunlight to continue growing. When there is no longer a risk of frost in the area, plant outdoors.

How to Germinate and Grow Nemesia from a Seed

Nemesia may be grown from seed, which can be bought, and this method is one of the most efficient and cost-effective ways to cultivate these plants.

Make use of pots or trays that have been filled with a commercial seed-starter mix or vermiculite that has been ground to a fine consistency.

The spoiled food should be dampened, and the containers should be placed in a position that is between 55 and 65 degrees Fahrenheit and has indirect light.

(In order for the seeds to germinate, it is necessary to cover them with soil.) The seeds will likely begin to germinate anywhere from five to ten days after being planted.

Continue to cultivate them in strong light until the time for planting has arrived after the threat of frost has gone. When the seedlings are approximately two inches tall, pinch off the growth tips to produce a bushy growth habit. This should be done as soon as possible.

Putting Nemesia in new pots and replacing the old ones

Nemesias are attractive plants that may be grown as specimens in pots placed outside. Make use of a container that is both spacious and permeable to drainage. The typical peat-based potting mix should be adequate for most gardening projects;

however, some gardeners prefer to increase drainage by adding some more sand, perlite, or vermiculite to the mixture. It is also feasible to utilize regular garden soil in containers; however, there must to be a substantial amount of compost mixed in with the soil.

When the top inch of the potting mixture starts to feel dry to the touch, you need to be sure to check the moisture level and add water as necessary.

Diseases That Are Frequently Seen In Plants

Nemesia does not have any significant issues with pests, however, there is a risk of root rot occurring in areas where the plants are growing in soil that is thick and has poor drainage.

The presence of root rot may be identified by the collapsing of stems at ground level. It is possible to avoid this kind of rot by watering the plant less and relocating it to a more sunny place.

Powdery mildew is another kind of mold that may be an issue in certain situations. Powdery mildew may be avoided by maintaining enough air circulation and appropriately watering plants (soaking the soil around the plant’s roots rather than spraying the foliage from above).

How to Bring Nemesia to Its Full Flowering Potential

If they are grown in appropriate circumstances, these plants seldom show any reluctance to bloom. However, there are ways to enhance the number of flowers produced and the amount of time they are in bloom, including the following:

If you want your plant to produce the most flowers possible, you should fertilize it once every two weeks using a balanced fertilizer that is water soluble.

Deadheading, also known as pinching off spent flowers, is a technique that may be used to encourage new blossoming as well as maintain the plant looking nice.

If you live in an area that experiences warm weather, providing some shade for your nemesia during the hottest part of the day may encourage it to flourish. In regions with a lower average temperature, on the other hand, the absence of blossoms might indicate that the plant is receiving an inadequate amount of sunlight.

If you notice that your plants have stopped flowering, you may try trimming them back by approximately a third to see if this helps them start blooming again.

Problems That Are Frequently Encountered With Nemesia

You won’t have to worry about most kinds of vermin in Nemesia, but there are a few things you should be aware of about the local culture:

There is a scraggly appearance to the plants.

The trailing kinds of nemesia are especially prone to forming long, straggly stalks without many blooms, particularly if they are grown in a site that receives less sunlight than full sun.

Cutting the stems down very severely will cause the plant to grow bushier and fuller as it recovers from the shock. This treatment is particularly helpful for plants that are contained inside containers or those are grown in hanging baskets.

The ends of the plants are broken off at ground level.

This is usually always an indication of root rot, which is a frequent issue that may occur if a plant is overwatered or if it is pushed to grow in compacted soil that does not drain well. In order to increase the soil’s porosity and drainage, it may need to be altered if the soil’s quality is inadequate.

Plants Die Back in Summer

If you have nemesia plants and you see that they are dying back during the summer heat, you should not instantly give up on them.

These plants do not like it when the temperature becomes really high, but if you drastically trim them back and ensure that they get enough of water, they will often react by bouncing back and producing another round of blooms in the autumn.


What kind of landscaping would benefit most from the incorporation of this plant into the design?

Nemesia is often used in landscaping not just as an edging plant or ground cover, but also in mixed borders, forest plantings, rock gardens, and hanging baskets. In addition, it is frequently grown in woodland plantings.

Is it possible to overwinter plants that are contained inside pots indoors?

When dealing with plants of the perennial genus, it is feasible to overwinter them in containers by relocating them to a protected position like as a porch.

In spite of this, most kinds of these plants are genuine annuals, which means that they will perish after their blooming time has come to an end. As a result, they are not suitable for use as houseplants.

Exist any types of plants that thrive in warm areas that are comparable to this one?

The fact that the plant often perishes (or at the very least withers and dies back) during the hottest parts of the summer is the most significant disadvantage of nemesia.

Consider planting angelonia, also known as summer snapdragon, if you enjoy the appearance of nemesia but live in an area where summer temperatures are too high for it to thrive. Nemesia is a tropical plant that thrives in tropical climates.

The heat of summer does not cause these plants to wilt as it does nemesia or typical snapdragons, thus they are able to produce an abundant amount of blooms throughout the season.

Angelonia is a perennial that is hardy in zones 10 and 11, although it is often grown as an annual in other zones that have hot summers, such as the Midwest and the Great Plains.

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