Re Linaria's comment: I've also been very wary of Lysimachia punctata, but occasionally used it. I planted it in a perennial garden (full sun, upgraded clay soil)) (installed in 2000) and have maintained that garden to date. I did get worried about it spreading, so put it in a pot in the soil, but found that it would not stay in. On the other hand, I've subsequently simply reduced it (pulling up/spading out runners), yearly after flowering, and had no problem maintaining it more or less in the same location. As per Morz: a variegated form ('Alexander') was present in another garden (semi-shade, upgraded clay soil) I maintained over about five years. It spread very minimally. I don't know how much of that was related to a contrast between variegated and non-variegated forms of the same plant (viz. more versus less vigorous) and how much was to do with it's semi-shade location. I wouldn't use any L. punctata in our own mixed perennial beds, because too many plants are maintained too close together.

aka botanical tulip ken Here is a link that might be useful: link .. down the page

I have had no luck at all keeping a Koi yellow. It seems to be connected to age and/or ph and other factors such as food.. The most recent was a nice bright yellow as the temperatures dropped two years ago. When they warmed up again, it was a lovely metallic gold. It stayed that color all summer and fall. The only thing I am wondering is how you managed to keep it yellow for so long.

That was an interesting stroll on your link. I think you have a very nice warm moonlight yellow rose to be proud of.........Maryl