Seed Swaps



Belonging to the Petunia genus, Petunia has a botanical name of Petunia.

Although some species of petunia are tropical perennials, today’s hybrids are usually grown as annuals.

Petunias are vigorous growers and and prolific bloomers; they like sun, some are fragrant and attract hummingbirds and butterflies.
The leaves are simple, light green, oval and along with the stems covered in small hairs, giving a sticky feel. Some petunia trail and are useful in pots and baskets, others are more compact and can be used to edge paths or at the front of the border.

Blooms appear in these approximate colours:   Cerise pink and   Violet and   Candy apple red. When mature, blooms are roughly 6.0 cm (that's 2.34 inches in imperial) in diameter. The mature flowers take a funnel form, with an approximate petal count of 5. When ripe, fruit appear in these approximate colours:   Android robot green. Leaves appear approximately as a   Forest green (web) and   La Salle Green

Petunia is a non-edible flower / ornamental annual, it will last but a year in its native climate.

Petunia normally grows to a spreading habit with a max height of 7.02 inches (that's 18.0 cm metric). This plant tends to bloom in mid summer, followed by first harvests in late summer.

Try planting Petunia if you'd like to attract butterflies and bees to your garden.

Popular varieties of Petunia with home gardeners are Cascading, Easy Wave™, Wave Purple, dwarf bedding mixed colors and Tidal Wave™.

Argentina is believed to be where Petunia originates from.

Being a fairly low maintenance plant, Petunia is normally quite easy to grow provided a minimum level of care is given throughout the year. It will be helpful to note the correct soil, sun and water needs of this plant to ensure that this plant thrives.

This plant info is provided by the myfolia gardener's wiki. All details about Petunia have been kindly provided by our members.

How to grow Petunia

  • Full Sun

  • Partial Sun

  • Medium

The flowers fade quite quickly, so it is important to encourage more buds to form. To do this it is really worthwhile to dead head the old flowers. This can be quite tricky as the buds and the immature seed heads look pretty much the same! The easiest way not to pull off the buds by mistake is to remember that the plant flowers advance down the stem. So a bud will be ahead (nearest the growing tip) of the open flowers and the developing seed heads will be behind (nearer the plant). Nip the developing seed heads off with your finger and thumb and this will make the plant make more buds and flowers.

Enjoys a full sun / partial sun position in your garden and remember to water moderately. Zone 5 to 9 are typically the USDA Hardiness Zones that are appropriate for this plant (although this can vary based on your microclimate). Planting Petunia in potting mix and loamy soil with a ph of between 5.5 and 7.0 is ideal for as it does best in weakly acidic soil - neutral soil. Keep in mind when planting that Petunia is thought of as half hardy, so although it can survive a small mild cold snap, it is wise to ensure that this plant is protected from frost damage.

See our list of companion Plants for Petunia to see which plants you should plant in close proximity to encourage growth.

Growing Petunia from seed

Petunia seed needs light to germinate, so don’t cover the seed.
They germinate quickly, and should be potted up individually as soon as they are large enough to handle

Sow 0.12 inches (0.3 cm) deep with a guideline distance of 0.78 inches (2.0 cm). Soil temperature should be kept higher than 18°C / 64°F to ensure good germination.

By our calculations*, you should look at sowing Petunia about 77 days before your last frost date .

Transplanting Petunia

Grow the seedlings on under cover, potting up as needed and keep under cover until all danger of frost has past. Expose the young plants slowly to garden conditions and plant out.
Petunia are traditionally used as summer bedding and can be used at the front of the border but are more often used in pots baskets and containers.

As Petunia is half hardy, ensure temperatures are mild enough to plant out (around 15°C / 59°F as a guideline) - wait until after your last frost date to be on the safe side.

Harvesting Petunia

Petunia flowers are best enjoyed on the plant,

Seed Saving Petunia

Many petunia are hybrids, so will not come true to seed. If you have a favourite that you cannot do without next year, it is possible to over winter under protection, and take stem cuttings in the summer

How long does Petunia take to grow?

These estimates for how long Petunia takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Start logging and journaling your observations to participate!

Days to Germination How long does it take Petunia to germinate?
22 days

Average 22 days | Min 1 days | Max 68 days (39)

Days to Transplant How long until I can plant out Petunia?
+ 81 days

Average 81 days | Min 65 days | Max 85 days (8)

Days to Maturity How long until Petunia is ready for harvest / bloom?
+ 40 days

Average 40 days | Min 10 days | Max 182 days (11)

Total Growing Days How long does it take to grow Petunia?
= 143 days

When should I plant Petunia?

Our when to plant Petunia estimates are relative to your last frost date.

Enter your frost dates and we'll calculate your sowing and planting dates for you!

When to sow The number of days to sow Petunia before or after your last frost date.
77 days before Last Frost Date

Other names for Petunia

Hybrid Petunia

Petunia x hybrida, Petunia x, Petunia hybrida

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