Seed are sometimes sold commercially while still enclosed within the hard wall of the fruit, which must be split open to reach the seed. Different groups of plants have other modifications, the so-called stone fruits (such as the peach) have a hardened fruit layer (the endocarp) fused to and surrounding the actual seed. Nuts are the one-seeded, hard-shelled fruit of some plants with an indehiscent seed, such as an acorn or hazelnut. Seeds are produced in several related groups of plants, and their manner of production distinguishes the angiosperms ("enclosed seeds") from the gymnosperms ("naked seeds"). Angiosperm seeds are produced in
Unwins Seeds A1(M) just north of the A14 Alconbury junction. It has garden seeds for flowers and plants. It has the largest share of the UK amateur seed market. Unwins Seeds Unwins Seeds is a British seed company based in Alconbury Weston, Huntingdon in Cambridgeshire. "The Times" describes Unwins as "a firm that has grown ... to become one of the most familiar features of Britain’s horticultural landscape", and the BBC calls the company "world-famous". Unwins Seeds was formed in 1903 by William Unwin by selling sweet pea seeds. His son Charles, who had an interest in sweet peas, joined the business