When To Plant Out China Asters

When To Plant Out China Asters

If you are growing china asters for the first time then you may well be wondering when is the best time to plant them out, well wonder no longer, I have the perfect guide for you.

When To Plant Out China Asters
When To Plant Out China Asters

China Asters should be planted out after all risk of frost has passed as they are very frost-sensitive plants. This time will vary by a few weeks depending on where exactly in the world you are.

For me, this comes out as usually around mid-May. Obviously, this is just a guideline and it can change year to year depending on the specific weather that year but it is a good guideline.

If you want to be really cautious then wait a couple more weeks after your last frost date before planting your china asters out.

When To Start China Asters

Now we know when to plant out china asters, but when exactly should we start our seeds?

Ideally, you want to sow your china asters about 6-8 weeks before planting them out. So for me, this would mean sowing them in early April or late march.

Sowing them this early you will need to sow them indoors or in a heated greenhouse.

You can get away with sowing them later and waiting until after the last frost and sowing them outside. I often do this as all of my windowsill space in the spring is usually already occupied with other seedlings.

If you do this though then they won’t usually be ready to flower until very late summer. This is not too unusually for China asters as they are more of an autumn flower rather than a summer one.

However, with an early sowing, you do get a much longer flowering period going from late summer all the way through autumn.

Late Sown Asters On 25th July
Late Sown Asters On 25th July

Above you can see my late sown asters on the left-hand side of the image. I didn’t sow these until well into spring as you can see from how small they are here on the 25th of July.

Late Sown Asters On 18th August
Late Sown Asters On 18th August

And here they are again in the middle of august after putting on a lot of growth, but as you can see, still no flowers.

China Aster In September
China Aster In September

And here are the same China Asters in September, in full flower.

China Aster In September
China Aster In September

So you can see from these images that you can sow China Asters much later than recommend and get a good flower display out of them. But that display won’t happen until into the autumn.