Is blue lobelia a perennial?

Asked By: Aureo Tovim | Last Updated: 14th February, 2020
Category: home and garden landscaping
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The great blue lobelia (Lobelia siphilitica) is considered a perennial herb. It has erect stems, ranges from 2 to 3 feet in height, and blooms in late summer.

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Just so, will lobelia survive winter?

Unlike its perennial cousins, annual lobelia dies back completely in the winter, though some types may grow from seed in the spring. Many annual lobelias are cold-tolerant and will survive longer into late fall or early winter than other types of annual flowers, but frost will kill them.

Additionally, how do you keep lobelia blooming? The lobelia produces prolific flowers.

  1. Place any hanging basket that contains trailing lobelia in full sunlight for the best growth.
  2. Water the hanging lobelia basket often to keep the soil moist but not waterlogged.
  3. Fertilize the hanging lobelia every other week using a general-purpose water-soluble fertilizer.

In respect to this, what do you do with lobelia in the winter?

Lobelia cardinalis

  1. Trim back the dead and dying stems and leaves.
  2. Water thoroughly, then rake a thick layer of loose mulch over the rosette of leaves when frost is in the forecast.
  3. Move potted cardinal flowers into a garage or other sheltered location for the winter.

Do Lobelia plants spread?

Growing Lobelia Plant Annual lobelia will grow nearly anywhere. Lobelia seeds can be sown directly in the garden or indoors for later transplanting. These plants typically require an area with full sun but will tolerate partial shade. Spread the tiny seeds just on top of the soil and water thoroughly.

36 Related Question Answers Found

Does lobelia come back every year?

Lobelia is a perennial plant that is often considered an annual because growing conditions must be perfect for it to survive to rebloom another year. More than 360 species of lobelia are grown as annuals, perennials or shrubs.

Is Lobelia a hardy?

Lobelia is a genus of about 370 species of annuals, perennials (even some aquatics) and shrubs. They are all basically perennials, but some are treated as annuals. Since they originated from the tropics, many are not hardy in our area and these we tend to treat as annuals.

How big does lobelia get?

It grows 10 inches tall and wide and displays better heat resistance than many other varieties. A beautiful sky-blue, trailing annual lobelia, 'Hot Water Blue' is bred to take the heat, surviving sultry summers with masses of blooms. Plants grow 8 to 12 inches tall in full sun to partial shade.

Should I cut back lobelia?

Yes. Cutting back lobelia plants improves their appearance and health. It also encourages the plant to produce more flowers over a longer period of time. The three types of pruning that benefit lobelia plants are removing spent flowers, pinching, and cutting back.

Can lobelia be divided?


Lobelia can be divided in the fall, however, that will disrupt the blooming cycle -- lobelia is a fall-blooming plant. The best time to divide lobelia is in the spring, just after the new growth begins to emerge.

What do you do with Salvias in the winter?

During the winter, if you discover heaving that has exposed a plant's roots, gently firm the Salvia back into the ground and spread a few inches of compost around its base for stabilization. Then put mulch back into place.

Are marguerites Hardy?

Although it is listed as a perennial, the marguerite daisy may be planted as an annual in certain climates and it really only thrives for two or three seasons. To increase the bushiness of this shrubby daisy and promote constant blooming, prune back or “deadhead” any dying flowers.

How do I protect my Salvias over winter?

Half-hardy perennial salvias can be left in the ground where they have been growing if the soil is not too cold or wet in winter. Cut back the top growth to 15cm and protect the roots and basal buds with a thick layer of manure or bark chippings. Uncover the plants in early spring when the worst of the frosts are over.

Why does my lobelia die?

Water Problems
During warm weather, leaves and flowers can dry out. If the dehydration is too severe, the plant may die. Water consistently so the soil stays moist and never draws away from the side of the container.

How do you care for perennial lobelia?


Perennial lobelia
Water Lobelia cardinalis plants whenever necessary to keep the soil or compost moist or damp. Feed with a general granular plant food each spring. Cut back old flower stems after flowering and the old foliage in autumn. Lobelia tupa may need some winter protection.

Which come back annuals or perennials?

Perennials come back every year, growing from roots that survive through the winter. Annuals complete their life cycle in just one growing season before dying and come back the next year only if they drop seeds that germinate in the spring.

What can I plant with lobelia?

Lobelia can be planted with any other type of flower that enjoys moist, rich soil. Astilbe and Iris are two such options, both liking the same conditions. Fern growing is another good choice. In shady areas, ferns and hostas grow well with lobelia.

How do you propagate lobelia?

How to Propagate Lobelia From Cuttings
  1. Cut Lobelia in the late spring.
  2. Cut only pieces of new growth that have not yet flowered.
  3. Fill the clay pot with potting soil.
  4. Push cuttings into the wet soil.
  5. Place your pot of cuttings in a shady area protected from wind and animal pests.
  6. Mist your cuttings twice a day with water.

How do you keep violas blooming?

Many people grow them as annuals, replacing them every year. You can grow them for spring bloom or fall bloom or both, if you can keep them alive during the summer. Should violas be deadheaded? Yes removing the spent blooms will keep the plant from setting seeds and will continue to bloom until the summer heat.

Can you keep lobelia indoors?


Growing Lobelia Plant
Lobelia seeds can be sown directly indoors. These plants typically require an area with full sun but will tolerate partial shade. They also prefer moist, rich soil. Start indoors about 10 to 12 weeks prior to the last frost in your region.

Does lobelia flower all summer?

The foliage and flowers are delicate, but lobelia flowers in abundance, blooming all summer right until frost. In spring and fall lobelias grow well in full sun. However, in summer the sun may be too strong for this plant and some shade will help keep it in bloom.

How many lobelia plants are in a hanging basket?

A general rule of thumb when planting a hanging basket is to use one plant per inch of basket diameter - so 12 plants per 30cm (12") hanging basket.

Plant spacing.
Plant Lobelia
Eezee Hanging Basket 12
22cm (9") basket 8
30cm (12") basket 12
30cm (12") patio container 10