Top 10 Easy Perennial Plants to Grow From Seed
The flower garden is not complete without some beautiful perennial plants that bring color and scent, year after year.
Instead of buying plug plants from your local grower, consider growing your own from seed.
Here is list of the top 10 easy to grow perennials, that even the complete novice could grow.
The wonderful thing about growing from seed is that you can produce a huge number of plants for very little monetary outlay.
It is not difficult. Perennials need a little care at the beginning, and will bring you years and years of joy, coming up every spring and delighting you with flowers summer after summer.
Many perennials have a spreading habit, and the area where they are grown fills out more with the passage of time, with very little input from you.
All the flowers on this page can be grown in USDA zones 4 - 8, or equivalent.
For the back of the border, nothing is more striking than a group of tall delphiniums.
They can grow up to almost 6 feet tall and have a spread of 3 feet.
Their towering, majestic spires make the perfect backdrop to smaller garden flowers, and they come back year after year, bringing delicious colors to brighten any garden.
Normally, delphiniums are a deep blue color, but many new cultivars have been developed in shades from white through pink to lilac and violet.
Delphinium seeds take 14 - 21 days to germinate, and require darkness as well as a gentle heat of 60 - 65οF.
- In early spring, place seeds in a compost-filled pot, cover seeds with compost or vermiculite, and place in a heated propagator or warm cupboard until you see signs of germination.
- When the plants are big enough to handle, usually when they have grown at least their second sets of leaves, transplant them into a seed tray or individual pots.
- As the weather warms up, harden the plants off by placing them in a cooler place or in a cold-frame before planting out in their final positions after all risk of frost has passed.
- Delphiniums are best planted in a sheltered area of the garden in direct sun or partial shade.
By the time the plants re-grow the following spring, after dying down for winter, they will have toughened up and will be able to survive any late frosts. Delphiniums are very hardy perennials.
Aquilegia grow best in the middle or the front of the flower border.
With a height or 2.5 feet and a spread of 2 feet, Aquilegia self-seeds easily, bringing yet more color into your garden, with their delicately-hued flower-heads with distinctive spur at the back.
Often called columbine, Aquilegia differ from their wild cousins by the number of petals on their flowers.
Slow to germinate, to Aquilegia seeds may take up to 3 months to appear, so don't throw the pot out thinking they have failed.
To germinate Aquilegia seeds:
- Sow in late spring or autumn on the surface of damp compost.
- Cover the pot or tray with polythene to keep the moisture in.
- Place in a light situation - a greenhouse shelf or windowsill in the house, out of direct sunlight.
- Keep the temperature between 60 - 68οC.
- Pot on when they are large enough to handle.
- Harden off before planting out in their final position.
- Space them 12" apart to allow room to grow.
Aquilegia look best planted in groups of 2 or 3, and spaced out all over the border in any space left by other groups of plants. They are very hardy and survive any kind of summer weather, dying down in winter and returning in the spring.
There are a wide range of cultivars available for this short-lived perennial, in colors ranging from bright yellows to deep reds.
With gorgeous daisy-like flowers, Rudbeckia is well worth growing from seed for the flower garden, as their happy faces lighten up any border.
Also known as Black-Eyed Susan, some Rudbeckias are annuals but most are perennial (check the seed packet).
To germinate Rudbeckias from seed:
- Sow on the top of a damp compost filled pot at any time of the year, or directly into the ground when the summer temperatures reach 60οF.
- If growing in a pot, apply a heat-mat or place inside a propagator at 70F until germination takes place, which is anything up to 3 weeks later.
- Pot on when large enough to handle, and plant out when all risk of frost is over.
- Plant your Rudbeckias 18" - 24" apart as their roots like to spread, in full sun or partial shade.
Each plant will grow 18" - 30" tall depending on variety.
Available in a wide range of colors depending on variety, Verbena is a wonderful perennial flower to grow in the garden.
It is not as hardy as some perennials, and will benefit from offering some kind of protective mulch for over-wintering.
They self-seed readily, and this causes them to spread to an even wider area than you originally planted them.
A definite front-of-the-border plant, showy Verbena is not only beautiful to look at, they exude an exceptionally attractive scent and are much sought-after by butterflies.
How to grow Verbena from seed:
- Start off in compost-filled pots in late winter/early spring.
- Place just 2 seeds in each pot, and pinch the smallest one out when they both grow.
- Verbena seed needs light to germinate, and a temperature of 60 - 65οC.
- Placing them on a light but not sunny window-shelf should suffice.
- As the weather warms up, gradually acclimatise each plant to the outdoors, by placing their pots outside for a few hours each day.
Finally, position each plant in a sunny border 10" - 12 apart.
5. Oriental Poppy
No flower garden is complete without the showy oriental poppy. They put on a stunning display in late spring/early summer, filling the border with their bright, happy blooms.
For about 6 weeks, they are a treat to the eyes in their flamboyant reds, pinks, purples and as many colors the breeders can make them, before they die back only to return the next year. Some varieties can flower again in August, if the plants are cut right back after flowering.
If you look for oriental poppy seeds, you will find a huge selection available in all the colors of the rainbow.
Some people think they are difficult to grow from seed, but there is only one basic rule to remember.
Poppy seeds are tiny and must be sown on the surface of the soil or compost, then light must be excluded in order for them to germinate.
If grown indoors or in a greenhouse early in the season:
- Scatter seeds on the top of compacted compost and water in well.
- Cover the pots with a folded newspaper.
- Check daily for signs of germination.
- At 55οF or above, oriental poppy seeds should germinate in 2 - 3 weeks.
- Pot on into individual pots or trays when large enough to handle.
- Put them outside for a few hours at a time to gradually acclimatise them to outdoors.
- Plant them in the border when all risk of frost is past.
Being perennial, all your little poppy plants will bring years of brightness and color into your flower garden.
There are a hundred different species of plants that come under the name of Veronica, but in this case we are going to look at Veronica spicata, a cousin of the common wildflower, speedwell.
With their wonderful spires of star shaped blue flowers, they only reach about 12" in height.
With a long flowering period between June - August, veronica spicata deserves a place at the front of the border where they can be enjoyed by everyone.
They also grow well in containers.
How to grow veronica spicata from seed.
- Choose a sunny spot in the garden, with good-draining soil. Waterlogged soil will kill your Veronica plants in winter.
- Rake over the soil to break it up and form a fine tilth.
- Scatter the seeds over the surface and rake in.
- Water well, if there is no rain.
- When seedlings appear, thin them out to 6" apart. if you take care when you lift them, you can replant them elsewhere.
Chrysanthemums are another huge family, with many different varieties to choose from.
Choose from daisy-like colorful flowers, to more rounded flowers right up to flowers that look like giant colorful puff-balls.
They are not true perennials, as the plants die in winter at the first frosts, but the flower seeds set root where they drop, so your chrysanthemums will come up in the same place, year after year, with no further input from you.
How to grow Chrysanthemums from seed
- Sow directly into the soil where they are to grow in September/October, and they will come up themselves in the spring. They require a sunny border with well-drained soil.
- if you get your seeds in the spring, sow in a propagator with a bottom heat of 65 - 70οF.Germination should take about 10 - 14 days.
- Transplant into individual pots or trays and gradually harden off.
- Plant into their final position when all risk of frost has passed.
- Dead-head flowers regularly to keep them flowering, but by late August leave them to grow, so they can form seeds for next year.
Reaching just 4 - 6" high, Dianthus is the perfect plant to grow at the front edge of the border.
Dianthus is a huge family with many different flowerheads and colors, but all follow similar growing patterns and are very easy to grow from seed.
I love perennials! Once they are grown, you only have to dead-head them and weed between them, as they give years and years of pleasure by coming up and filling your garden with flowers. Insects, bees and butterflies especially love a flower filled garden.
Dianthus make super edging plants.
Simply sow your seeds into trays and place in the cold-frame in the Fall, and plant them out into their final positions in the spring, in a sunny border.
You can also grow them in pots in a greenhouse, or on a sunny window shelf in the spring, and plant out when big enough.
Also known as Sweet Alison, Alyssum makes a lovely, sweetly scented, edging plant. if you look through the seed catalogues, you will find that Alyssum is available in whites, yellows, violets, pinks, blues and purples.
The species Lobularia maritima is snow white and forms a beautiful carpet of flowers, into which a blue flower like annual lobelia would look stunning.
It is a hardy perennial, and while resistant to summer heat or drought, Alyssum prefers growing out of direct sunlight, with at least partial shade.
Sow the seeds directly into the soil where you want it to grow in the Fall, or grow it under glass in pots in the spring.
You can also plant them directly in the soil once the weather warms up in spring.
Either plant or thin them to 6" apart, to give each plant space to grow.
I just love Red Hot Pokers, even if they have suffered a name change from tritoma to Kniphofia, after the German botanist who discovered them growing in South Africa.
Growing up to 3 feet tall, Red Hot Pokers are best situated in the middle of the border where their fiery spires bring the heat of summer alive.
They flower all summer long, and are fully hardy, so will return year after year.
When they become overcrowded, their crowns can be separated and replanted elsewhere.
Kniphofias like plenty rain and moisture, and will grow really well for you if there is a wet summer where you live, but like most plants, they do not like getting their feet wet, so good drainage is essential.
How to grow kniphofia from seed
- Red hot poker seeds require stratification (a cold period) but you only need to do this if someone has given you seed from their garden. Seed producers will have already stratifed their seeds before sale.
- Plant in trays or pots in the greenhouse, but protect from direct sunlight until the seedlings are up.
- Germination can take up to 3 months.
- Can also be sown where you want them to grow in the Fall.
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