Q&A for How to Grow Sweet William Plants

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Do Sweet William plants spread on their own?

Katie Gohmann
Professional Gardener
Katherine Gohmann is a Professional Gardener in Texas. She has been a home gardener and professional gardener since 2008.

Katie Gohmann

Professional Gardener

Expert Answer

In my experience, no. Each plant gets taller and bushier, but they won't spread. You don't need to leave a whole lot of space between each plant when planting.

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Can Sweet Williams be sown in a container on the patio?

Katie Gohmann
Professional Gardener
Katherine Gohmann is a Professional Gardener in Texas. She has been a home gardener and professional gardener since 2008.

Katie Gohmann

Professional Gardener

Expert Answer

Yes, they will grow in a container. Ensure the pot has adequate drainage holes and check the soil's moisture levels daily.

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Question

What are the white spots on the leaves of my sweet William?

Community Answer

A type of fungus that commonly grows on plants. Be careful, as it can spread from plant to plant. There also may be little white bugs on it, so use pesticide to exterminate them and the spots should go away.

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Question

Are hummingbirds attracted to this plant?

Community Answer

Yes, hummingbirds are attracted to Sweet Williams plants. Other plants that attract hummingbirds and butterflies can be found on this sheet: http://www.mossgardencenter.com/sheet/butterfly.pdf

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Question

How deep should the new plant be planted?

Community Answer

Depends on terrain, if moist and not usually hot than about 10 cm, if hot then 7-9 cm and if cold 13-16 cm.

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Question

Will Sweet Williams survive snow?

Community Answer

From my experience in England, Sweet Williams have survived winters with very hard frosts and some snow, even extra hard winters with prolonged snow and temperatures of -20 degrees.

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Question

Should I pinch the center out of the plant that is grown from seed if it is 4 inches tall in a pot in a greenhouse?

Community Answer

No, because if you do, you will mess it up and the plant will grow awkwardly.

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Are Sweet William plants supposed to grow tall before any blooms are present?

Community Answer

They do not have to grow very tall; about 12 cm should be enough, but it depends how old it is.

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Question

Will deer eat sweet William?

Community Answer

No, generally deer will not eat Sweet William.

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Question

Can I plant Sweet Williams in the same garden with rhododendrons?

Community Answer

We have had both Sweet Williams and rhododendrons in the same garden for a few years now and they always come back each season.

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Will my Sweet William plants grow again if they've stopped flowering?

Community Answer

If you are asking if they will bloom again, then yes. Simply trim them back and they will begin to bloom again throughout the summer months.

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Question

How far apart from each other should I plant Sweet William plants?

Community Answer

General advice says to plant them 6 inches apart. But I grew mine at 3 inches apart in pots and they worked fine still.

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Question

I have some SW plants grown from seed this year but supposedly to flower next year. They are still in plant trays. Do I plant now or how to over winter? Still in the containers.

Community Answer

Plant out in the flowering position in late August till mid-October, before frosts. Sow seeds about May time.

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