You should be able to plant out brassicas now. Broccoli and calabrese, Brussels sprouts, summer cabbage.
If you have started beans in pots, both runner and French these can go into the outside too. Leeks may well be ready to move to their final position. Ideally they want to be about pencil thickness. Don't follow the old guidance to trim the leaves and roots when transplanting leeks. It has been proven to be of no benefit and is counter-productive. Celery can go out now as well.
Outdoor tomatoes can go to their final position now. When moving plants from greenhouse to outdoors it is a good idea to condition them to the move. Take them out in the day and put them back at night for a few days or move from greenhouse to coldframe. This avoids shocking the plant by a sudden and drastic change in climate.
There is a lot to sow this month and with many crops you can sow one set and then a few weeks later re-sow to give you a succession of fresh vegetables at the peak of perfection. In dry weather it is a good idea to soak your seed drill before sowing and then just water with a fine rose after.
* French and Runner Beans
* Maincrop peas
* Courgette and Marrows
Beetroot, french beans, carrots, kohlrabi, peas, lettuce, endive,radish should be sown at intervals throughout the summer months to provide a constant supply Successional sowing ensures you always have fresh crops at the peak for your table
In the greenhouse
Keep pinching off the side shoots with your tomatoes and keep an eye out for pests such as aphids, whitefly, red spider mite. If you are subject to attack by these pests it is worth checking out biological controls as these are perfectly safe to use and, used correctly, more effective than traditional chemical controls. Many of the chemical controls of the past are no longer available anyway so the organic alternatives are now the mainstream choice.
Make sure your fruiting plants have sufficient water when the fruit is swelling. This is critical to a good crop.
Thin out plums and apples in June. Better to have one reasonable apple than three miniature marbles. Nature naturally tends towards this and sheds excess fruit. This is known as the 'June Drop'. It's best to thin out after this.