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Gardening

Find tips and tricks to make your garden or allotment flourish on our Gardening forum.

Lemon Verbena - Help!

7 replies

AbsoluteYawns · 13/05/2023 07:01

I've got 2 new plants from the G. C.
Left them indoors in pots for potting into larger pots this weekend.
Today noticed lots of tiny flies on the leaves!
Is this salvageable or should I throw them away?
I'm a novice gardener so all advice is appreciated!

OP posts:
pd339 · 13/05/2023 07:17

It’s fine. Those flies won’t cause any problems. Just plant the plants out and let them get on with it.

Random789 · 13/05/2023 07:19

I would wash as many of the flies off as possible (and any sticky redidue they may hav left) and then get the plants potted on asap. If the plants were struggling a bit in their cultural conditions, this would have made it much easier for the flies to get a foothold. I don't think the plants will have suffered irrevocably.

AbsoluteYawns · 13/05/2023 07:59

Thank you both very much!

OP posts:
MereDintofPandiculation · 13/05/2023 10:17

It would help to know what the flies are like. Possibilities in descending order of likelihood

  1. whitefly. Little moth-like white flies. They need to be cotrolled. Start by washing them off, then use yellow sticky fly papers - but be aware these will trap good insects too. Or you can use the furniture brush on your vacuum cleaner - early in the morning when it’s still cold and they haven’t the energy to fly away. Or biological control (Encarsia)
  2. aphids/greenfly Little green wingless blobs. They will destroy a plant quicker than whitefly. Hold the plant sideways over the sink and hit the leaves with your hand, so the aphids jump off into the sink. Then spray any remaining ones with water with a tiny bit of washing up liquid. The water drowns them, the washing up liquid makes sure they get properly wet
  3. Fungus gnats Little black flies crawling up the pot and buzzing around. These are hatching from grubs in the soil, so wash off all the soil from the roots and put gravel on top to deter the females from laying eggs in the soil
AbsoluteYawns · 13/05/2023 16:51

Thanks @MereDintofPandiculation they are little black flies looking like fruit flies to me.

OP posts:
MereDintofPandiculation · 13/05/2023 21:37

Fungus gnats.

AbsoluteYawns · 16/05/2023 06:47

Thanks all. I put the plants out and the gnats have gone!

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