Arrange small jar vases along a dining table
Use a few small jars to spread flowers along the table while leaving room for food and conversation.

Choose jars that sit steadily
Small jars are useful because a modest bunch of flowers can become several arrangements. Select clean jars without chips or cracks and remove any lid rings that make the rim awkward. Check that each base sits flat. A tall narrow jar holding long stems may be less stable than a shorter, wider one, even if it looks more elegant empty.
Set the jars on the table before filling them. Include placemats, glasses and the serving dishes you usually use. An arrangement that occupies the only space for a salad bowl will have to move as soon as dinner starts. Leave clear areas between jars instead of turning the whole center into a continuous row of glass.
Repeat a detail, vary the stems
The jars do not need to match exactly. Similar heights or a repeated flower color can connect them. Try one or two stems per jar and cut them to a height that allows people to see one another across the table. Remove foliage that would sit below the water, and use clean tools appropriate to the stems.
Give each small arrangement its own shape. One can have an upright stem, another a slight outward lean, provided the stems do not make the jar easy to tip. Distribute visual weight along the table rather than putting the fullest jar at one end. View the arrangement while seated, not only while standing over it.
Use plants suitable for your household, considering children, pets and possible irritation. Do not assume an unidentified garden cutting is harmless because it is attractive. Keep flowers away from dishes and ingredients, and avoid shedding material over food.
Keep water changes uncomplicated
Fill the jars away from the table and dry their bases before placing them on a surface protected appropriately from moisture. A small tray beneath an individual jar can help with moving it, but it should not become so large that it defeats the open spacing. Avoid fabric wraps that hide leaks or remain damp underneath.
Refresh the water and remove deteriorating stems as needed. Short stems can be recut and moved to an even smaller vessel when a taller arrangement no longer looks fresh. Wash jars thoroughly after use before storing them, and do not mix decorative craft materials into vessels you intend to use for food without considering their suitability.
For a longer table, make two small groups rather than a rigid jar at every place setting. The gaps give room for hands, plates and the ordinary movement of a meal. The flowers can be part of the table without becoming the main logistical problem on it.