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The Fastest Growing Flower Seeds

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If you are a new gardener or are working on a garden project with children, finding flower seeds that grow rapidly is important. The fastest-growing seeds germinate in a matter of days and flower in roughly two months. An important consideration for very young children is seed size, which should be big enough to pick up easily between thumb and finger, such as a nasturtium or sunflower seeds. In contrast, petunia seed is fine as dust.

Germination vs. Bloom Time

Some flower seeds, such as zinnias (Zinnia spp.), may germinate a few days after planting. Zinnias average from three to five days. However, that doesn’t mean they are among the fastest-growing flowers, because it can take zinnias 75 to 90 days to flower. Cosmos (Cosmos spp.) is another prime example. Although its seed germinates in seven to 10 days, cosmos doesn’t flower until 90 to 120 days after planting. In contrast, California poppy (Eschscholzia californica) may take about 21 days to germinate in U.S. Department of Agriculture plant hardiness zones 6 to 10, but flowers within 60. The fastest-growing flower seeds are those that germinate in 14 days or less and flower within 70 days. These include marigold (Tagetes spp.), nasturtium (Tropaeolum majus), annual phlox (Phlox drummondii) and sunflowers (Helianthus spp.). Aside from its genetic heritage, the speed of a flower’s growth depends on having its needs met. In the beginning, these conditions include seed planting depth and other germination concerns, such as light, temperature and moisture.

Impact of Seed Planting Depth

Planting a seed incorrectly can impede or end growth. Some seeds need light to germinate and must be sown on top of their growing medium, whether outdoors in the garden or indoors on seed flats. These include impatiens (Impatiens spp.) and petunias (Petunia spp.). For seeds that need darkness – such as those of calendula (Calendula spp.), phlox and sunflowers – a general rule is to plant at a depth twice the seed’s diameter. For example, large sunflower seeds require planting 1 1/2 to 2 1/2 inches deep. Marigolds, however, germinate whether planted under or on top of soil. Check seed packets for information about planting depth.

Other Needs for Quick Germination

Proper germination temperature and moisture also speed initial growth. Temperature requirements vary for the seeds of different plants. For example, the optimum daytime germination temperature for marigolds is 70 degrees Fahrenheit whereas snapdragons (Antirrhinum spp.) like it colder at 65 F. For most flower seeds, the daytime temperature needs to be somewhere between 60 to 80 F, and nighttime temperatures should be 10 to 15 degrees cooler. For indoor seed starting, if you feel comfortable with the temperature in your house, your seeds likely will too. Moisten the soil before planting, because watering immediately after sowing can cause seeds and soil to shift haphazardly. Keep the soil moist but not soggy during germination to avoid rot.

Seeding Location and Growth

Some plants do better if seeded outdoors. If seeded indoors, transplanting may slow their growth. These plants include cosmos, marigolds, nasturtium, sunflowers and zinnias. The rule for seeding outdoors is to wait until the threat of frost has passed. Flowers that do better when seeded indoors include impatiens and petunias. For seeds planted indoors, the growth time different flowers need before outdoor transplanting varies. Although impatiens may not be ready for transplanting until about eight weeks old, zinnias started indoors will become leggy and root-bound if kept inside that long. Consequently, if starting seeds indoors, you need to time germination based on a transplanting date when the danger of frost will have passed.

The Fastest Growing Flower Seeds. If you are a new gardener or are working on a garden project with children, finding flower seeds that grow rapidly is important. The fastest-growing seeds germinate in a matter of days and flower in roughly two months. An important consideration for very young children is seed size, …

The 7 Fastest Growing Flower Seeds

Novice gardeners who’ve left it too late in the season to grow challenging plants are being encouraged to opt for the fastest growing seeds to enjoy a blooming backyard this summer.
A team of garden experts behind GardenBuildingsDirect.co.uk have looked into the plants and flowers that grow the quickest, so that gardening beginners can still experience the joys of a thriving backyard over the summer months.

Petunias, poppies and sunflowers have been recognised as some of the fastest growing flowers, taking only a fraction of the time to germinate and bloom compared to some of the more challenging plants.

A spokesperson for GardenBuildingsDirect.co.uk said: “If you’re a new gardener or you simply can’t find the time to spend hours pruning and preening your backyard, finding flower seeds that grow quickly is essential.

“Although, it’s important to remember that getting the seeds is only half the job – planting them correctly and making sure they’re well cared for is also imperative, so make sure you read the back of the seed packet to see what each individual plant needs to thrive.”

1. Cornflowers

Bees love the flowers that rise up on cornflowers’ straight stems in early summer, and this plant is unfazed by changeable spring weather. The petals of this quick-growing flower are even edible!

2. Nigella

Also referred to as Love-in-a-Mist, these determined plants grow steadily in cool spring weather and start blooming in early summer.

3. Petunias

Pest resistant and easy to please, petunias can be had in endless colours, but they’re a lovely plant to have simply for their fragrance.

The fastest growing poppies (California poppies) can grow from seed to bloom in only 60 days! Poppies thrive in full sun and once established, these quick-blooming flowers provide bees and other pollinators with protein-rich pollen in early summer, when little else is in bloom.

Surprisingly cold-hardy, sunflower seedlings often survive spring frosts and you can see the earliest blossoms march to maturity rather than waiting for late summer. These showy blooms can grow to six feet or more in just three months, and they look great in flower beds or along borders.

Sweet peas, with their ruffled blossoms and slender tendrils, have a stunning fragrance and like it cool – so try not to leave in full sun constantly. You should also soak the seeds for several days before planting.

This classic flower, with bright blossoms of yellow, orange and mahogany, often show themselves within just eight weeks of sowing. For best result, plant them in full sun and in well-draining soil.

The 7 Fastest Growing Flower Seeds Novice gardeners who’ve left it too late in the season to grow challenging plants are being encouraged to opt for the fastest growing seeds to enjoy a blooming