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Thoughts about the garden - what would you recommend

in Plants
I was just enjoying the morning cooler temperature and had a stroll through the garden. I'm not so happy with my planting this year. I have far too many lilac colours and especially, because I grew them from seeds, too many identical plants.
I need something white. What would you recommend that flowers in May and last at least until July? I used to have Leucanthium, which I do like, but they look nice only one year, and don't grow well the second year, so I didn't replace them.
My new Spirea Big Bang has got burned leaves (but also new grow) and I wonder if the description "full sun" is really what it needs (and gets).

My new Vibernum hardly grows. This might be normal in the first year.
Should I cut the Berberis Orange Rocket or just leave it grow on its own?
My Euphorbia margalidiana had finished flowering and I cut the flowers off, but I'm not sure if I did it right. The RHS website says cut down to the ground, but in December, when I cut just the flowers, the new flowers grew marvellously.
Should I cut here or even near the bottom of the picture or the entire stems, but that would leave me with a naked place over the winter?

My Hitcote Lavender is a meter high and falls over. Do you have a recommendation for a lavender that doesn't grow that high? I had to build a temporary brick wall to get the path free, but the other side flips over too into the plants.

My Polygonatum starts to regrow in a wider and wider circle, When would be the best time to replant it to another place, Autumn, Winter or March?
The Cherry tomatoes are green, but not one single one shows sign to get orange. Normally, I have the first orange tomatoes at the beginning of July.
I will now start working, so no reply from my side until 4 PM.
Many thanks in advance. I'm grateful for any advise.
I need something white. What would you recommend that flowers in May and last at least until July? I used to have Leucanthium, which I do like, but they look nice only one year, and don't grow well the second year, so I didn't replace them.
My new Spirea Big Bang has got burned leaves (but also new grow) and I wonder if the description "full sun" is really what it needs (and gets).

My new Vibernum hardly grows. This might be normal in the first year.
Should I cut the Berberis Orange Rocket or just leave it grow on its own?
My Euphorbia margalidiana had finished flowering and I cut the flowers off, but I'm not sure if I did it right. The RHS website says cut down to the ground, but in December, when I cut just the flowers, the new flowers grew marvellously.
Should I cut here or even near the bottom of the picture or the entire stems, but that would leave me with a naked place over the winter?

My Hitcote Lavender is a meter high and falls over. Do you have a recommendation for a lavender that doesn't grow that high? I had to build a temporary brick wall to get the path free, but the other side flips over too into the plants.

My Polygonatum starts to regrow in a wider and wider circle, When would be the best time to replant it to another place, Autumn, Winter or March?
The Cherry tomatoes are green, but not one single one shows sign to get orange. Normally, I have the first orange tomatoes at the beginning of July.
I will now start working, so no reply from my side until 4 PM.
Many thanks in advance. I'm grateful for any advise.
I ♥ my garden.
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Posts
I planted Viburnam Watanabe last October it has also hardly grown.
I remember having too many lilacs it is easy to do. Over the last few years I have added Jewel colours [like Monty Don] I don't think you can go wrong with this idea.
Luzula nivea - May to early June
Erigeron karvinskianus - May onwards
Feverfew - June to Aug, not sure. I just added this this year, from a few dug-up seedlings I gathered.
Verbascum chaixii 'Album' - July to Aug
Eurybia divaricata - late July to October
Would like to get more but for some reason the garden centres round here don't have it
I ♥ my garden.
I will definitely think about a sort of "don't fall over" protection and when my lavender is over, then I would try as you, @WhereAreMySecateurs , suggests. Your one is 30cm, the RHS website says up to 45cm max, with my conditions, it might get 50cm.
@GardenerSuze I will move the Polygonatum in Autumn when we hopefully will get rain. I will also then move the Spirea into the bed near the house where it gets no sunshine over midday.
In the middle of the former fern bed is now a Deutzia, some Astrantia, Diacentria and Wild Geranium. I moved a Weigela from the pot into this bed and a Viburnum.
I will go through the list that you made, @Loxley and see what likes clay soil or isn't fussy, and prepare for next year
If somebody knows where to cut my Euphorbia plant, that would made my day finally.
Thank you all so much for your advise that keeps me busy in the next weeks
I ♥ my garden.
I ♥ my garden.