dyzzypyxxy said:Hi and welcome to ATP. Hope we can help you out.
It would help to know where you are, and what your climate is like right now - have you had a cool, rainy summer so far, or hot and dry? Has anything changed drastically in the past week or two?
Those look like fairly small plants, but you say "I usually don't have problems with my lavender plants, they are usually thriving". So are these new plants this year, or did you cut back old plants from last year? Or do you plant new ones each year? (that's what I have to do here in Florida because they just won't live through our humid summers)
Did you use a different potting mix than you have used before? Some of the "Moisture Control" mixes have that water holding gel stuff in them and can stay too wet for a dry climate plant like lavender.
tarev said:The appearance of over and underwatering oftentimes appear the same, but at this time of the year in summer and if your temps are soaring higher than usual, I would think it is getting underwatered.
greene said:Could the effect of the metal and brick be causing increased heat and decreasing the humidity in the immediate area? I think the word may be 'transpiration"..
sooby said:According to the UK newspaper I read, it has been fairly hot there, up to 98F (36.7C) earlier in July.
I have a lavender plant (L. dentata) in a pot on a sunny windowsill because it isn't likely to survive a winter outside here and I don't want to risk it. It is a far more thirsty plant in a pot than I expected and absolutely hates to get too dry. Ditto for rosemary in a pot, surprisingly. I checked a few articles from lavender growers this morning and it seems this is a known thing with potted lavender (and rosemary) - while they certainly don't want wet feet they both also hate to get too dry.
On another note, having gravel in the bottom of a pot doesn't increase drainage (it actually reduces it- the technical term is a perched water table) but does reduce the amount of potting soil available to the plant. Personally I would replace the gravel with more potting media with same texture throughout the pot. You say the soil was mixed with plenty of grit, did you use garden soil or a soilless potting mix (or maybe John Innes if they still sell that there these days!).
sharkfur said:Interesting - first thing I learned about these things is gravel or pebble in the bottom...
I know, it does seem counter-intuitive but its true. When I first learned that coarser material at the bottom of a container impeded drainage rather than improved it I did my own experiment and was surprised to find that it is true. See also:
Glad to hear the plants are feeling better, I imagine so are you