I have a bush last year with hardly had any leaves yet a lot of flowers. I thought it was because of the winter. This year it has a few more leaves, not many, and a lot of flowers. Does it need a fertilizer or food? Should I prune it after it's done blooming and see if that helps?
You have the right idea - pruning. Here is an article which will show you what can happen when you rejuvenate your spirea with a pruning:
http://www.greenridgelandscaping.com/blog/id/64/how-to-fix-an-ugly-spirea
For more information on growing spirea, please visit the following link:
https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm
Can a spirea shrub be transplanted? It's not fully mature yet and would like to plant it elsewhere. I have the perfect spot for it and not happy where it's planted now.
Whenever possible transplant a Spirea in late winter or early spring, before the new growth starts.
It can be done now, with a bit more care. Water the shrub well in the couple of days prior to digging.
Tie up the branches to keep them from breaking.
Make sure you dig the hole twice as wide as the root ball and plant it at the same depth.
Water well the first few weeks and the a bit less through the summer.
https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm
I recently purchased 3 starters - Golden Flame Spireas. They look so beautiful but I just learned that they are invasive. Is it true? And if it is true, should I get rid of the plants I just purchased? I am very concerned about these plants. I would greatly appreciate your advice. Thank you
Japanese Spiraea (spiraea japonica) is considered to be invasive in the Southeast US (Source: http://www.clemson.edu/extension/hgic/plants/landscape/shrubs/hgic1074.html)
Gold Flame spiraea is actually a cultivar of spiraea japonica so it would be considered invasive by association. It is advised to grow with caution due to invasive potential. Doe this mean you need to get rid of your plants – no, it does not. However, it is great that you are thinking about preserving the landscape. If you really want to be pro-active, one thing you can do is engage in responsible gardening by removing spent seed heads and developing seed heads before they have a chance to disperse.
For more information on the care of spirea bushes, please visit the following link:
https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm
My spirea are burning up and the rest of my new flowers are great. This happens every time I plant them no matter where I plant them. What am I doing wrong?
Your spirea may need a little extra water if the temperature in your zone has been higher than normal. If your watering routine has been the same for the spirea and your other plants, that may need to change. Add some mulch around the plant to keep more moisture in, and watch the time of day that you water: don't get the foliage wet right before the sun will beat down on it for any length of time. This article may also help you: https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm
I have had spirea for a number of years, 2 Goldflame and one dark green. The leaves on the Goldflame are changing to dark green but I haven't fertilized. Maybe it caught a bit of seaweed solution, but I don't think I went near these with that.
Thank you for your answer.
According to Clemson University's Agricultural extension, it's normal for the leaves on the Goldflame cultivar of Spirea to change to a green hue in the summer. It's surprising that you haven't had this happen in years past -- but it could be simply because the plant is more mature and well-established. It should change again in the fall, too, to orange-copper or orange-red.
These articles contain some information about Spirea:
http://www.clemson.edu/extension/hgic/plants/landscape/shrubs/hgic1074.html
https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm
How to splice a part of a spirea and grow another one?
This link will help you with propagation methods.
https://www.ndsu.edu/pubweb/chiwonlee/plsc368/student/papers02/ddevine/spiraea.html
My spirea shrubs have gotten overgrown and mostly branches vs. leaves. Can I trim them right down to the ground and will that make them fill in? Do they need to be dormant to trim them?
These articles will help you:
https://www.gardeningknowhow.com/ornamental/shrubs/spirea/growing-spirea-shrubs.htm
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/pruning-trees-shrubs/