Like most highly reputable suppliers, we deliver annual Cosmos<\/a> and Sweet Peas<\/a> seedlings in Jumbo Plugs, which are the best value for that type of plant.<\/p>\n
![\"Jumbo](\"https:\/\/blogs.ashridgetrees.co.uk\/wp-content\/uploads\/2026\/04\/pot-plug-size-comparrison.jpg\")
<\/figure>\n<\/div>\nWhat Almost No One Tells You About P9 Plants!<\/h3>\n
Experienced gardeners know that plants in P9 pots are great value if you are happy to wait one year<\/strong> before planting them outside in most cases. It\u2019s still recovering from the trauma of being cut from its original roots, and forced to grow new roots out of its leaf buds! The best thing to do with a plant in a P9 pot is usually<\/strong> to pot it up into a 1-3 litre pot<\/strong>, and nurture it in a sheltered place for a growing season, or at least overwinter (evergreen plants in greenhouses should grow roots through the Winter), to beef up its root system<\/strong> before planting it out into the open soil.<\/p>\n To be clear: people successfully plant millions of P9 size plants out directly into the soil<\/strong>, and it works out fine.<\/p>\n If you bought two of the same plant in P9 pots, you would have a bigger, stronger plant with better roots after a year on the one you potted up, compared to the one you planted out directly to garden topsoil.<\/p>\n Potting up tends to be most beneficial for skinny plants like climbing vines; a little clematis P9 has less wood than a pencil! Lavender<\/a> turns out to be one of those plants that performs well as a P9 planted out directly into warm soil in mid\/late Spring. It\u2019s easier to pot a P9 plant up into a 2 or 3 litre pot, that\u2019s what I do at home, but a 1 litre pot is adequate.
Why?<\/p>\nThe P9 plant is usually a cutting that only has about a year\u2019s root development<\/h4>\n
It\u2019s not fully ready for the big bad world of soil life and weather out in your garden. <\/p>\n\n
For Best Results Planting P9 Pots: Pot them Up!<\/h3>\n
At the other end of the sensitivity scale, tough, scrubby shrubs like Lavender<\/a> or Berberis<\/a> do well as P9s planted into warm soil in May or June.<\/p>\nLavender P9s Are Good to Plant Out In Spring<\/h4>\n
Part of the reason is young Lavender should be trimmed to maintain low, bushy growth, which also reduces pressure on the establishing roots. <\/p>\nHow to repot P9 plants quickly<\/h2>\n
I prefer using a bigger pot and not filling it, rather than filling a smaller pot, unless I am short on growing space. <\/p>\n\n