Dense clusters of tiny white flowers cascade over a plant shelf, with leafy climbing stems behind.
White flower clusters cascading over the edge of a plant shelf.Photo supplied by jennyzhuang.
Small white four-petaled flowers with pale yellow-green centers clustered above narrow green leaves.
White flowers and narrow leaves seen up close.Photo supplied by jennyzhuang.
Clusters of small pink and purple flowers with pale centers above narrow green leaves.
Pink and purple flower clusters among narrow leaves.Photo supplied by jennyzhuang.
A mass of small white sweet-alyssum flowers with yellow-green centers.
Photo: Carl Lewis · CC BY 2.0. Cropped for display. Species reference photo; the source does not identify the Carpet of Snow cultivar.
4 photos · Swipe or scroll →

White and pink-purple flower clusters, with a closer look at trailing growth. The pictured cultivars are unconfirmed; this guide uses compact ‘Carpet of Snow’.

Plant Care Steps · Growing guideplantcaresteps.com/plants/sweet-alyssum/

Flowers · A bright porch or patio in mild weather

Let’s grow
sweet alyssum.

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Lobularia maritima

This plan is for Carpet of Snow sweet alyssum

Light: Afternoon shade helps in hot weather.

Planting steps ↓

YOUR SIMPLE GROWING PLAN

One pot. Here’s the plan.

Before you start Start in mild spring or fall weather; in California, check local suitability before planting because sweet alyssum can escape gardens.

What you need · pot, mix & supplies
  • One draining pot about 10 inches wide and at least 8 inches deep
  • 1 compact Carpet of Snow sweet alyssum nursery plant
  • Fresh potting mix, a watering can, and scissors

The soil

Miracle-Gro Organic Potting Mix (US, feeds for up to 2 months)

A bright porch or patio in mild weather. Start with nursery plant.

THE POT10-inch pot

At least 8 inches deep with drainage; let the plant spread over the rim.

HOW MANY1 nursery plant

Choose a small Carpet of Snow sweet alyssum start.

See the planting illustration
Illustrated starting setup: 10-inch pot; 1 nursery plant.
10-inch pot · 1 nursery plant At least 8 inches deep with drainage; let the plant spread over the rim. Choose a small Carpet of Snow sweet alyssum start. Original illustration; not to scale.
  1. 01

    Give one plant its own pot

    Fill with damp mix and leave an inch below the rim. A small start will spread; you do not need to cram in a whole bedding pack.

  2. 02

    Plant at the existing level

    Keep the top of the root ball level with the surrounding mix. Water slowly until excess drains away.

  3. 03

    Choose gentle sun in hot weather

    Use a bright spot with afternoon shade when summers are intense. Check the mix rather than relying on flowers to tell you it is thirsty.

  4. 04

    Trim a tired display

    After a flush fades, lightly shear spent flowering tips, leaving leafy growth. Keep care steady while fresh shoots develop.

Other ways to start
Start with 6 tiny seeds+

Press 6 Carpet of Snow seeds onto the damp surface near the pot’s center; do not bury them. They need light. Mist gently as needed. Once seedlings have true leaves, snip extras and retain one strong plant for this pot.

YOUR EVERYDAY ROUTINE

Water & fertilizer at a glance.

Water when
Keep the seeded surface damp. Once established, water as the top inch starts drying; let the pot drain. Empty the saucer or outer pot after draining.
Fertilizer
Miracle-Gro Water Soluble All Purpose Plant Food (US 24-8-16)
Amount
1 tablespoon in 1 US gallon of water
What that amount covers
Mix into water. Apply only enough solution to wet this pot and drain; the mixing batch is not the amount to pour on.
How often to feed
Every 14 days during active growth.
When to start or pause
After starter feed ends, feed only during active growth. Skip while another fertilizer is active; food will not correct summer heat.
Product directions ↗

Use level measures and the exact US formula shown. If your label differs, follow it; do not transfer this dose to another formula or combine feeding programs.

See the watering & feeding illustrations
A soil check followed by slow root watering and free drainage.
Check before watering. Keep the seeded surface damp. Once established, water as the top inch starts drying; let the pot drain. Original illustration; not to scale.
Fertilizer measure for Sweet alyssum: 1 tablespoon in 1 US gallon of water. Mix into water. Apply only enough solution to wet this pot and drain; the mixing batch is not the amount to pour on.
1 tablespoon in 1 US gallon of water Mix into water. Apply only enough solution to wet this pot and drain; the mixing batch is not the amount to pour on. Every 14 days during active growth. After starter feed ends, feed only during active growth. Skip while another fertilizer is active; food will not correct summer heat. Original illustration; not to scale.
Illustrated reference for Miracle-Gro Water Soluble All Purpose, US 24-8-16; not actual packaging.

US PRODUCT REFERENCE

Miracle-Gro

Water Soluble All Purpose

24-8-16

Soluble: mix into water

Check the official US product ↗

Illustrated reference; check the manufacturer’s current packaging and US label.

Sprouting and seasonal flowers
03 / WHAT HAPPENS NEXT

The named seed supplier gives about 5–14 days for germination in suitable warmth. A rooted nursery start gives a faster flower display. Growth forms a low mound, with flowering often slowing in hot summers.

Planting windows and regional suitability

Mild spring and fall conditions are useful starting windows. Regional suitability matters: sweet alyssum can escape gardens in parts of California, so check local advice before choosing it there.

For regional planting windows, find your local Cooperative Extension office ↗.

Something looking off?

Why did my white flowers stop blooming?+

Hot weather can slow flowering. Lightly trim faded growth, check moisture, and give afternoon shade in intense heat. Wait for cooler conditions instead of repeatedly increasing fertilizer.

Why did the seeds fail when I buried them?+

Sweet alyssum needs light to germinate. Press seed onto moist mix without burying it; keep the surface damp with gentle watering.

Will the plant spread outside its pot?+

It can reseed, so a pot does not contain the seeds. Remove spent growth before seed ripens and pull volunteer seedlings. Check local planting guidance, especially near natural areas.

Checking local suitability and plant size
Check local advice before allowing reseeding

California’s Invasive Plant Council lists sweet alyssum as Limited invasive. In affected areas, choose a locally recommended alternative rather than letting it reseed. This guide does not recommend it for every US location.

Choose a compact type for this pot

This plan uses a compact seed-grown type such as Carpet of Snow. Larger vegetatively propagated hybrids can spread much farther; check the mature width on a nursery label.

Sources, dates & detailed PDF

Editorial plans, not results from a Plant Care Steps growing trial. Compiled with AI assistance; they have not yet had an independent horticultural review. Editorial approach.

Something needs updating? Suggest a correction

Published · Updated

By jennyzhuang

Sources checked View sources ↗

Detailed PDF ↓

Full reference edition with expanded explanations and illustrations. Its publication dates appear in the file.

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Soil: Miracle-Gro Organic Potting Mix (US, feeds for up to 2 months)

By jennyzhuang

Sources checked View sources ↗

Published · Updated

Read the online Sources section for linked references and the full reference PDF.

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Plant Care Steps · Care card

Sweet alyssum

Lobularia maritima

Water
Keep the seeded surface damp. Once established, water as the top inch starts drying; let the pot drain.
Light
Sun or light shade. Afternoon shade helps in hot weather.
Temperature
Mild-weather flowers. A bright porch or patio in mild weather
Common problems
Why did my white flowers stop blooming. Hot weather can slow flowering. Lightly trim faded growth, check moisture, and give afternoon shade in intense heat. Wait for cooler conditions instead of repeatedly increasing fertilizer.