When To Plant Black Eyed Susan

Plant black eyed susan seeds in late spring after the soil warms, or scatter them in fall for self-sowing. Knowing exactly When To Plant Black Eyed Susan is the key to getting those bright yellow blooms all summer long. You don’t need to be a master gardener to get this right. Just a little timing and you will have a garden full of color.

These flowers are tough and forgiving. They can handle a bit of neglect once they are established. But getting the planting time right gives them a huge head start. Let’s break down the best times to plant, whether you are using seeds or starter plants.

The best time depends on your climate and how you are planting. For most gardeners, late spring is the sweet spot. The soil needs to be warm, around 60 to 70 degrees Fahrenheit. You can check this with a simple soil thermometer.

If you live in a warmer zone, like 7 or higher, you can also plant in early fall. This gives the roots time to grow before winter. The plant will then bloom the following spring. Fall planting works great for seeds too.

Planting Black Eyed Susan Seeds Outdoors

Seeds are the cheapest way to get lots of plants. You have two main options for when to sow them.

Late Spring Sowing: Wait until after your last frost date. The soil should be warm to the touch. Sow seeds about 1/8 inch deep. They need light to germinate, so don’t bury them too deep.
Fall Sowing: Scatter seeds on bare soil in late fall. Let nature do the work. The cold winter will stratify the seeds. They will sprout on their own in spring. This mimics how they grow in the wild.

For spring sowing, keep the soil moist but not soaked. Seeds usually sprout in 7 to 14 days. Thin the seedlings to about 12 to 18 inches apart once they have two sets of true leaves.

Starting Seeds Indoors

Starting seeds indoors gives you a longer growing season. This is helpful if you have short summers.

Start seeds 6 to 8 weeks before your last expected frost date.
Use seed starting mix in small pots or trays.
Sow seeds 1/8 inch deep and cover lightly.
Place them in a warm spot, around 70°F. A heat mat helps.
Provide bright light once they sprout. A grow light or sunny window works.
Harden off seedlings for a week before transplanting outside.

Transplant them after the danger of frost has passed. Space them 12 to 18 inches apart. Water them well after planting.

Planting Potted Black Eyed Susan Plants

If you buy plants from a nursery, you have more flexibility. You can plant them in spring or early fall.

Spring: Plant after the last frost. This gives them the whole season to establish.
Fall: Plant at least 6 weeks before the first hard frost. This gives roots time to settle in.

Dig a hole twice as wide as the pot. Place the plant at the same depth it was in the container. Backfill with soil and water deeply. Mulch around the base to retain moisture.

Best Climate Zones For Planting

Black eyed susans are perennials in USDA zones 3 through 9. They are very adaptable. But your planting time shifts based on your zone.

Cool Climates (Zones 3-5)

In cold areas, spring is your only reliable window. The growing season is short. Plant seeds in late May or early June. Start seeds indoors to get a head start. Fall planting is risky because the ground freezes early.

Make sure to mulch heavily in winter. This protects the roots from freeze-thaw cycles. The plants may die back completely but will return in spring.

Moderate Climates (Zones 6-7)

These zones are ideal for black eyed susans. You can plant in both spring and fall. Spring planting should happen in April or May. Fall planting works in September or October.

Seeds sown in fall will naturalize well. They will bloom slightly earlier than spring-planted seeds. This gives you a longer display of flowers.

Warm Climates (Zones 8-9)

In hot areas, fall is often better than spring. The heat can stress young plants. Plant seeds or transplants in September or October. They will grow through the mild winter and bloom in spring.

If you plant in spring, do it early. Aim for March before the heat sets in. Provide afternoon shade if possible. Water regularly to keep them going.

Soil Preparation Before Planting

Good soil prep makes a big difference. Black eyed susans are not picky. But they do best in well-draining soil.

Loosen the soil to about 12 inches deep.
Mix in some compost or aged manure. This adds nutrients.
Remove any weeds or rocks.
Check the drainage. If water pools, add sand or perlite.

These plants tolerate poor soil. But they bloom better in soil that is not too rich. Too much nitrogen makes them grow lots of leaves and few flowers.

Sunlight Requirements

Full sun is best for black eyed susans. They need at least 6 hours of direct sunlight daily. More sun means more blooms.

They can handle partial shade. But you will get fewer flowers. The stems may also be leggy and flop over. For the best display, pick a sunny spot.

Spacing Your Plants

Proper spacing prevents disease and promotes airflow. Space plants 12 to 18 inches apart. For a natural look, group them in clusters of three or five.

If you are planting seeds, you can scatter them and thin later. For transplants, measure the spacing before digging. Crowded plants are more prone to powdery mildew.

Watering After Planting

Watering is critical right after planting. New plants need consistent moisture to establish roots.

Water deeply once a week if there is no rain.
For seeds, keep the top inch of soil moist until they sprout.
Once established, they are drought tolerant. Water only during dry spells.

Overwatering can cause root rot. Let the soil dry out between waterings. A layer of mulch helps retain moisture and keep roots cool.

Fertilizing Tips

Black eyed susans do not need much fertilizer. Too much can reduce flowering.

Add a balanced, slow-release fertilizer at planting time.
Use a 10-10-10 formula or similar.
Do not fertilize again until the next spring.

If your soil is rich in organic matter, you may not need any fertilizer. Watch the plant. If leaves are dark green but few flowers, cut back on nitrogen.

Common Mistakes With Planting Time

Even experienced gardeners make errors. Here are the most common ones to avoid.

Planting too early: Cold soil can rot seeds. Wait until the soil warms up.
Planting too late: In fall, late planting leaves no time for roots to grow.
Not hardening off: Indoor seedlings need a week to adjust to outdoor conditions.
Overcrowding: Thin seedlings to avoid competition and disease.

Avoid these and your plants will thrive. Patience is key, especially in spring.

Dealing With Frost

A late frost can kill young plants. Always check the forecast before planting.

Cover plants with a frost cloth if a frost is predicted.
Use old sheets or blankets as a cover.
Remove the cover in the morning when temperatures rise.

If you planted seeds and a frost hits, they may still survive. Seeds are more resilient than tender seedlings. But it is better to wait.

How To Extend The Blooming Season

You can enjoy flowers from summer into fall with proper timing.

Plant a mix of early and late varieties.
Deadhead spent flowers to encourage more blooms.
Water during dry periods to keep plants healthy.

Some varieties bloom longer than others. Check the seed packet for bloom time. Staggering your planting also helps.

Self-Sowing For Next Year

Black eyed susans are great self-sowers. They drop seeds that grow the next year.

Leave some flower heads on the plant in fall.
Do not cut them back until spring.
The seeds will scatter and germinate naturally.

This gives you free plants every year. Just thin them out if they get too crowded.

Frequently Asked Questions

Can I plant black eyed susan in summer?

Summer planting is possible but risky. The heat stresses young plants. If you must plant in summer, do it in the evening. Water deeply and provide shade for the first week.

What month is best for planting black eyed susan seeds?

For most zones, May is the best month for spring sowing. For fall sowing, October works well. Adjust based on your local frost dates.

Do black eyed susans come back every year?

Yes, they are perennials in zones 3-9. They die back in winter and return in spring. In colder zones, mulch them for protection.

How deep should I plant black eyed susan seeds?

Plant seeds 1/8 inch deep. They need light to germinate. Just barely cover them with soil or sprinkle them on top and press down.

Can I plant black eyed susan in pots?

Yes, they grow well in containers. Use a pot with drainage holes. Plant in spring after frost. Water more often than in-ground plants.

Final Tips For Success

Timing is everything with black eyed susans. But they are forgiving plants. Even if you are a few weeks off, they usually survive.

Watch your local weather. Use a soil thermometer for accuracy. And do not be afraid to experiment with fall sowing. It is the easiest method of all.

These flowers attract butterflies and bees. They make great cut flowers too. Plant them in drifts for a natural look. They pair well with coneflowers and ornamental grasses.

With the right planting time, you will have a garden full of cheerful yellow blooms. They are low maintenance and high reward. Enjoy the process and the results.

Remember to water new plants regularly. Mulch to keep weeds down. And deadhead for more flowers. Your black eyed susans will thank you with months of color.

Now you know exactly When To Plant Black Eyed Susan. Get your seeds or plants ready. Pick the right time for your zone. And watch your garden glow.