Last summer we had the front of our house landscaped, and as part of it we had a small border dug around a bay window for planting some low-lying shrubs etc. The contractor filled it with soil from another part of the garden. I thought it would be nice to plant a lavender hedge as it is a West facing bay and gets a lot of hot sun on it after about midday in the summer (when its not raining). The soil was fairly heavy clay I think so I tried to dig in a couple of bags of grit before planting. I planted about 16, 20-30cm bushy Lavandula Augustifolias last September.
They seemed to do quite well and got a bit bigger, then went dormant for the winter. Now as its starting to brighten up a bit they seem to be coming to life again with definite signs of new growth. BUT I am a bit worried because a lot of them seem to be developing slightly brown leaves which I have definitely not noticed before. My concern is that the soil is not draining enough - when I feel it it feels very soggy and damp. The leaf browning is only minor at the moment, but noticeable and I am concerned that this is the start of something very bad!
So my questions are:
1. Shall I do nothing and just see how they go as the weather warms up a bit? OR, is this a sure sign of poorly draining soil and do I need to act NOW before they all eventually die?
2. If i need to act, would this be the right thing to do - remove all plants, remove the soil, replace it with 50:50 mix of compost and grit, and replant lavenders. Cross fingers! ?
This is the first time I have ever grown lavender so some advice would be great! Obviously I would prefer to do nothing as to replace the soil would be quite a lot of work (although doable)
Thanks in advance!