Dioon spinulosum, giant dioon or spiny dioon, is a cycad endemic to limestone cliffs and rocky hillsides in the tropical rainforests of Veracruz and Oaxaca, Mexico. It is one of the tallest cycads in the world, growing to 16 meters in height.

Giant dioon (Dioon spinulosum) is a tall, low-maintenance cycad ideal for patios and containers, thriving in full sun and subtropical winter interest.

Dioon spinulosum

Encephalartos lehmannii, commonly known as the Karoo cycad, is an evergreen tree belonging to the genus Encephalartos. It thrives in full sun or partial shade and prefers a sheltered position with south- or west-facing aspect. This cultivar grows best in well-drained loam or sandy soil with neutral pH and average moisture. Hardy to UK zone H4, it is suitable as a specimen plant or for cultivation in a conservatory. Interest in this plant is particularly notable during spring and summer, and it can be propagated by seed or offsets.

Karoo cycad (Encephalartos lehmannii) is an evergreen specimen thriving in full sun or partial shade, ideal for conservatories and sheltered gardens.

Encephalartos lehmannii

Macrozamia is an upright evergreen plant belonging to the Zamiaceae family. It thrives in full sun on a south-facing, sheltered aspect and prefers well-drained, neutral loam soil. Hardy to UK zone H4, it is suitable for use as a specimen plant, in conservatories, or on patios. Best planted in a suitable position with watering during establishment, Macrozamia is propagated by seed and offers seasonal interest in spring and summer.

Macrozamia thrives in full sun, hardy to RHS H4, ideal as a specimen plant for patios and conservatories with spring and summer interest.

Macrozamia

Macrozamia communis is an Australian cycad found on the east coast of New South Wales. The common name for the species is burrawang, a word derived from the Daruk Australian Aboriginal language; this name is also often applied to other species of Macrozamia. It is most abundant on the south coast of the state. The plants grow in open forests. In the wild it grows across Australia and New South Wales. Grow it in full sun and loam soil. In UK gardens it is hardy through an average UK winter (RHS H4). It works well for specimen plant, conservatories and patios. It tolerates neutral soils, well-drained conditions and south-facing aspects. Plant in well-drained soil in a suitable position. Water during establishment.

https://en.wikipedia.org/wiki/Macrozamia_communis

Macrozamia communis

Macrozamia riedlei, commonly known as a zamia or zamia palm, is a species of cycad in the plant family Zamiaceae. It is endemic to southwest Australia and often occurs in jarrah forests. It may only attain a height of half a metre or form an above trunk up to two metres with long arching fronds of a similar length. The seeds are consumed by birds and animals, and can be a favoured part of the human diet when prepared correctly. In the garden it prefers full sun and loam soil. In UK gardens it is hardy through an average UK winter (RHS H4). Suggested uses include specimen plant, conservatories and patios. It tolerates neutral soils, well-drained conditions and south-facing aspects. Plant in well-drained soil in a suitable position. Water during establishment.

https://en.wikipedia.org/wiki/Macrozamia_riedlei

Macrozamia riedlei

Macrozamia spiralis is a species of cycad in the family Zamiaceae. It is endemic to New South Wales in eastern Australia, where it is found in sclerophyll forest on low-nutrient soils. Plants generally lack a trunk and have 2–12 leaves that range up to 100 cm (40 in) in length. Grow it in full sun and loam soil. In UK gardens it is hardy through an average UK winter (RHS H4). It works well for specimen plant, conservatories and patios. It tolerates neutral soils, well-drained conditions and south-facing aspects. Plant in well-drained soil in a suitable position. Water during establishment.