Nemesia Flower Seeds, Nemesia strumosa Flower Seeds
Nemesia strumosa / spp. • Scrophulariaceae • Native to South Africa
Grow Nemesia Flower Seeds, Nemesia strumosa for colorful blooms in home gardens. Ideal for borders, pots, pollinator beds, and cut flower displays, with fresh seed packs for easy seasonal planting.
Plant Name: Nemesia Seeds
Quantity: 100 Seeds
Selected: Nemesia Seeds / 100 Seeds
Germination depends on soil, temperature, moisture, and care. See our return policy for details.
At a glance
Nemesia is highly sensitive to heat and will drop its blooms and go dormant or decline quickly if temperatures regularly push above 75 to 80 degrees Fahrenheit, so timing your planting around your local cool season is critical.
Botanical profile
Meet the Nemesia Flower
Step-by-step planting
Growing nemesia from seed is a rewarding process, but it does ask you to pay attention to timing, temperature, and moisture at every stage.
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1
Start Seeds at the Right Time
Sow nemesia flower seeds indoors 8 to 10 weeks before your last expected frost date, or outdoors in fall if you garden in a mild winter climate where temperatures stay above freezing.
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2
Prepare a Light Seed Mix
Fill trays or small pots with a fine, well-draining seed-starting mix, moisten it thoroughly before sowing, and press seeds gently onto the surface since nemesia needs light to germinate and should not be buried more than a very thin layer deep.
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3
Maintain Cool Germination Conditions
Keep your seed tray in a spot where temperatures stay around 55 to 65 degrees Fahrenheit, as nemesia germination is most reliable in cool conditions and warmer temperatures can inhibit sprouting.
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4
Keep Moisture Consistent
Mist the surface regularly to maintain even moisture without waterlogging, as the seeds need consistent humidity to sprout but will rot if the mix stays soggy.
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5
Provide Bright Light After Sprouting
Once seedlings emerge, move them to a bright location with at least 6 hours of direct or very bright indirect light daily, or place them under grow lights to prevent leggy, weak growth.
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6
Thin and Transplant with Care
When seedlings have two sets of true leaves, thin them to the strongest individual per cell and harden them off gradually over 7 to 10 days before transplanting outdoors into well-draining soil or containers.
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7
Deadhead and Monitor for Heat
Pinch off spent flowers regularly to encourage continued blooming, and watch soil moisture closely during nemesia container growing since pots dry out faster and dry roots combined with rising temperatures accelerate decline.
Year-round care
Spring
- Sow after last frost
- prepare soil with compost
Summer
- Water regularly
- feed monthly
Fall
- Harvest before frost
- store well
Winter
- Rest
- store seeds cool and dry
Full specifications
Shipping
- Orders are delivered within 8 to 16 business days.
- All orders include tracking.
- Free shipping on all orders.
- Seeds are packed in moisture-resistant, resealable foil packets.
Germination
Germination rates vary depending on climate, soil conditions, and care. Seeds perform best when planted in the right season at the correct temperature, with consistent moisture and adequate light. We take quality seriously and each batch is tested before packaging. If you have concerns about your seeds, reach out and we will do our best to help.
Frequently asked
Questions about Nemesia Flower Seeds
When should I start nemesia seeds indoors?
Start nemesia seeds indoors 8 to 10 weeks before your last frost date if you are planting for spring. In mild climates where winters are frost-free or nearly so, you can sow in early fall for winter and spring blooms, which is actually when nemesia does its finest work.
What temperature is best for nemesia germination?
Nemesia germination proceeds most reliably when soil temperatures are in the 55 to 65 degree Fahrenheit range. Warmer conditions, particularly anything consistently above 70 degrees, tend to reduce sprouting and can cause seeds to go dormant rather than germinate. Germination timing also varies depending on your specific soil mix, moisture levels, and how closely you can maintain that cool temperature range.
Why has my nemesia stopped blooming in summer?
This is completely normal behavior for nemesia and not a sign that something has gone wrong. Nemesia is a cool season annual flower by nature, and it is genetically programmed to shut down blooming when temperatures rise. Once daytime highs consistently exceed 75 to 80 degrees, most plants will stop flowering and may die back entirely.
Can nemesia be grown in containers or hanging baskets?
Nemesia is an excellent choice for nemesia container growing and works particularly well in hanging baskets where its mounding, slightly trailing habit can spill attractively over the edges. Use a well-draining potting mix, choose a container with good drainage holes, and be prepared to water more frequently than you would for garden-bed plants, since containers warm up and dry out faster, which can shorten the blooming season.
Is nemesia toxic to dogs or cats?
Nemesia is not currently listed on the ASPCA toxic plant database as a known hazard to dogs or cats, which is reassuring for pet owners who garden. That said, any plant material consumed in large quantities can cause stomach upset in animals, so it is still sensible to discourage pets from chewing on your plants, and if you have concerns about a specific pet, a quick check with your veterinarian is always worthwhile.
How far apart should nemesia plants be spaced?
Space nemesia plants about 6 to 8 inches apart in garden beds, which gives each plant enough room to fill out nicely while also creating the kind of full, lush planting that shows off the flowers well. In containers, you can plant a little more closely, around 4 to 6 inches apart, for a fuller immediate look, though adequate airflow between plants helps reduce the risk of fungal issues in humid conditions.
How do I get nemesia to rebloom after summer heat?
If your nemesia goes dormant or declines in summer heat, cut the plants back by about half and reduce watering slightly without letting them dry out completely. As temperatures cool again in late summer or early fall, many nemesia plants will push out fresh growth and return to blooming. This cut-back approach works best in climates with distinct cool seasons rather than areas that stay hot well into autumn.