Hi Waynesworld,
I'm not a flower expert but my first thought was about sunlight. Are your plants getting equal amounts, do they prefer shade, what is the ground conditions like, I have quite a small flower growing area, which is flat, but on one side it is very sandy and in full sun and the other side (about 30 feet away) is quite damp (sometimes water logged) and doesn't get the sun quite the same.
I hope this points you in the right direction.
i have just found this on another site hope it helps.
The dry weather has certainly contributed. Hot, dry conditions have favoured the two-spotted spider mite (Tetranychus urticae). These creatures feed on plant tissues causing extensive damage in high populations. They feed on a variety of plants both indoors and out. Cut off and remove dead leaves and clear up plant debris to reduce overwintering sites. Water the plants well, they may not produce any more leaf this year, but mites do not like damp conditions. The plants should recover and grow next year. Look out for early signs of this pest next spring and early summer, treating with insecticidal soap spray if found.
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