Wind
The weather is a bit mixed at the moment and there are some strong winds around which is great for keeping densely-foliated plants like zucchini, pumpkin and cucumber well ventilated and fungus-free.
However, many plants are at an increased risk of being toppled as they hit maturity. The same plants that benefit from good ventilation have fairly soft foliage and delicate stems that are easily dislodged from their supports. Tall growing sunflowers and Jerusalem artichokes are at risk from being blown over just as they reach their magnificent best.
It's worth spending a little time checking that everything is well-supported and adequately tied-in. Use bamboo canes for tall growing plants like tomatoes and mesh to support sprawling plants like cucumbers, beans and peas.
Tie stems just below a leaf joint and make sure that fruiting stems (on eggplants and cucumbers for instance) and trusses (on tomatoes and beans) are not constricted. If you have a clump of sunflowers then put stakes at each corner and encircle them with thick twine to give them some extra stability.