What a lovely idea, I think it is a very good and caring thing you are all doing, I wish many more people would become involved in tidying the graveyards and planting bulbs and flowers to make it a more friendly environment for relatives and friends to visit.
I am over from Ireland visiting my son and I was at Brandwood cemetery today visiting my daughters grave as it is 30 years since she died from measles and nearby there are many older graves there which are uncared for or with broken headstones.
I think that you are allowed to cultivate 18 inches in front of the headstone and in the past I have planted some bulbs but with so many trees around it attracts squirrells who dig them up.
Best Wishes to you all and I hope the weather is kind to you on that day.
Louisa