Growing perennial plugs for first time

Hi all,

I know this isn't fruit and veg growing but i hope this will complement the garden and attract lots of natural pest control

I recently planted on some perennial mini plugs I bought online. These were https://www.thompson-morgan.com/p/pe...ction/t47606TM as well as 48 lavender plugs which are munstead and hicote.

I have noticed since planting on that a lot of plugs appear to have more than one plant. if you look at the lavender it looks like there are 2 or 3 plants in each plug, other plants also appeared to have the odd exta. I assume they put in a few extra seeds into these plugs in case they dont germinate? Does this mean that i infact have extra plants and I can split these or should I just let them grow together and split at a later date, or will they be too prone to root disturbance by then? Or am I being silly and they plants are just bushy?

Also, I was told to pinch the top of perennials to ensure a busy plant, but is this the case with all perennials? Will it suit the lavender and other perennial in the T and M collection?

Thanks

S