Just a thought - but do you empty pots completely, clean and use new compost mix before planting. I'm sure you do - but I didn't in a couple of troughs where I found vine weevil. Keep trying
I have six different types of lavender growing in the garden. All successful in a mixture of sunny & semi-shaded locations, in four pots & two in borders. Only two of the plants in pots have at times shown signs of a few leaves dying & on closer inspection greenfly was well camouflaged on the leaves & tiny weevils had invaded the soil. A quick regular squirt of the plant & soil with some washing up liquid mixed with warm water sorted it. They don't like to sit in water but do like to be watered daily in dry weather & a good general plant food helps too. Plenty of horticultural gravel or broken pots in the base of the pot before adding the compost when planting will keep them well drained. Adding bonemeal to the soil can help to prevent disease, pests & encourage healthy root growth. They also require fairly intense pruning Sept & early spring to encourage new healthy growth (don't prune now). Snails will affect them in sufficient numbers so invest in some organic ferric phoshphate based snail bait (this breaks down into natural soil fertiliser) or sprinkle all bran around the garden it fills up the snails so they don't attack the plants so much. To check if it's snails affecting them check on the plants in torchlight after dark.
If purchasing from a garden centre they may have come from a fairly protected or warm environment so it might be worth gradually hardening them off by keeping the plant indoors at night for a few days & putting outside just in the day & then put it outside permanently on a warm day. One of my lavenders wilted in it's first few days after planting out straight away but I kept gently lifting it with my hands, watering around the plant trying to avoid the leaves & a bit of feed it is now flourishing with lots of flower heads.
Hope you get to enjoy the varied pinks, blues, whites & purple flowers with their delicious scents soon. Some varieties have softer fern like leaves which create a bit of variety from the needle like varieties, all are beautiful. The bees love them so you will be helping encourage the important wildlife too. Lots of lavender luck.
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Just a thought - but do you empty pots completely, clean and use new compost mix before planting. I'm sure you do - but I didn't in a couple of troughs where I found vine weevil. Keep trying
I have six different types of lavender growing in the garden. All successful in a mixture of sunny & semi-shaded locations, in four pots & two in borders. Only two of the plants in pots have at times shown signs of a few leaves dying & on closer inspection greenfly was well camouflaged on the leaves & tiny weevils had invaded the soil. A quick regular squirt of the plant & soil with some washing up liquid mixed with warm water sorted it. They don't like to sit in water but do like to be watered daily in dry weather & a good general plant food helps too. Plenty of horticultural gravel or broken pots in the base of the pot before adding the compost when planting will keep them well drained. Adding bonemeal to the soil can help to prevent disease, pests & encourage healthy root growth. They also require fairly intense pruning Sept & early spring to encourage new healthy growth (don't prune now). Snails will affect them in sufficient numbers so invest in some organic ferric phoshphate based snail bait (this breaks down into natural soil fertiliser) or sprinkle all bran around the garden it fills up the snails so they don't attack the plants so much. To check if it's snails affecting them check on the plants in torchlight after dark.
If purchasing from a garden centre they may have come from a fairly protected or warm environment so it might be worth gradually hardening them off by keeping the plant indoors at night for a few days & putting outside just in the day & then put it outside permanently on a warm day. One of my lavenders wilted in it's first few days after planting out straight away but I kept gently lifting it with my hands, watering around the plant trying to avoid the leaves & a bit of feed it is now flourishing with lots of flower heads.
Hope you get to enjoy the varied pinks, blues, whites & purple flowers with their delicious scents soon. Some varieties have softer fern like leaves which create a bit of variety from the needle like varieties, all are beautiful. The bees love them so you will be helping encourage the important wildlife too. Lots of lavender luck.